Json To Json Mapping Java

JSON (Java Script Object Notation) is a lightweight data-interchange format. This eliminates the costs/issues of reflection while still delivering a programming experience that is on par with the one we get from Java SE webservice mappings. This is a common task for Java developers to convert JSON to Java objects and vice-versa so I show you how to do that with examples. With Spring MVC Framework, its so much easy to map JSON String to Java Objects or convert Java Objects in to JSON string. Steve Hannah, created a pretty cool set of tools to map POJO's (plain old Java objects) to JSON structures by using compile time object mapping. You just need to add it to your message converters. For example, if you have a JSON key named timestamp, set this parameter to {"ts": "timestamp"} to map this key to a column named ts. Annotate any Java class then use JsonWriter to emit JSON from java or JsonReader to convert JSON to java objects. Jackson in a high performance, one of the fasted JSON parsing library, which also provides streaming capability. With the release of EclipseLink 2. fm podcast JAX-RS Client / Jersey: HTTP Tracing J4K, Quarkus, ThinWAR Startup, EJB, CDI, JavaMail--or 65th airhacks. Do not forget to check for latest dependency at maven site. Something like this format:. A JSONObject constructor can be used to convert an external form JSON text into an internal form whose values can be retrieved with the get and opt methods, or to convert values into a JSON text using the put and toString methods. JSON -> Java objects -> Mapping -> Java objects -> JSON An second approach is to use a templating framwork (like Freemarker or Velocity) in combination with a serialization framwork. Example: filter { json { source => "[categories][value]" } } You may want to add a target option to store the parsed contents under the categories field, and probably also a remove_field option to remove the [categories][value] field that you're probable no longer interested in. str - The JSON string to parse into a Java Object. You can use it to map a JSON RPC command from a webservice on an object, creating a more generic service. Only implementation is needed. Actually, I meant HTML to JSON conversion. There could be several key -> Map lines in the Json object. ) method instead of mapper. It needs to take a data dump. These examples are extracted from open source projects. How to Map JSON to Java Object by Annotation? May 21, 2017 Saurabh Gupta Leave a comment Jackson provide annotation for mapping Java and JSON properties that help when mapping fields in JSON and Java objects are having different names and some properties are additional and not match. JavaScript Object Notation (JSON) is a lightweight language independent data interchange format used for enterprise messaging or B2B communication much like XML. In this post, we look at 3 different examples to convert Java. We can also stream JSON encodings directly to os. The goal of J2J is simply the generation of JSON from Java and mapping exiting JSON back again to native Java objects. Learn default and customized mappings for JSON-B and see it in action in a JAX-RS web application, in this course with instructor and developer Ketkee Aryamane. That's all on How to convert JSON String to Java object using Jackson library. Convert Json to POJO using Java If you have a json which you want to map into POJO without writing the full POJO class then you can make use of jsonschema2pojo library. The logic of. Throws: IOEXception - Thrown if malformed JSON is read, java. This chapter contains the following sections:. Converting between JSON and XML Json. Encoding JSON in Java. Use this annotation when your JSON property names are different to the fields of the Java object class, and you want to map them. Similarly, load your JSON document that is to be validated, into an instance of JsonNode class provided by Jackson. [code] /* * SendRequestForData * */ public void sendRequestForData() { final ProgressDialog progressDialog = new ProgressDialog(t. Launching Xcode. java-json/java-json. As a data-exchange format, it is widely used in web programming. Jettison is a StAX implementation that reads and writes JSON. i had saw any codes in blogs, but all this codes has problem with Array. This provider can read or write JSON into/from org. If you are using Spring 3. Learn default and customized mappings for JSON-B and see it in action in a JAX-RS web application, in this course with instructor and developer Ketkee Aryamane. Previous data-binding posts gave the idea about how the POJO's are mapped to JSON and viceversa using ObjectMapper API. Controlling JSON to POJO mapping. The value can be Boolean, JSONArray, Number, String or JSONObject. For example, when I define a JSON property in my schema of type string, if I also attach the rule "format" : "uri" to that property (because my string is actually a URI) then my corresponding Java property will now have the type java. This will create an output Json file after the Java object is converted. Makes JSON easy to read. In the examples above we always used bytes and strings as intermediates between the data and JSON representation on standard out. We will be mapping this Input JSON to our POJO (declared below). json_populate_recordset(base anyelement, from_json json, [, use_json_as_text bool=false] SETOF anyelement Expands the outermost set of objects in from_json to a set whose columns match the record type defined by base. The open-source hibernate-types project allows you to map Java objects or Jackson JsonNode as JPA or Hibernate entity properties, and, thanks to our awesome contributors, we have added support for storing type-safe JSON collections. Hello Bro, I am using Volley libraries to fetch data from server and parse data,Hope this will help you. That has been the real reason for wider adoption of JSON. Note that the JSONObject will be an instance of OrderedJSONObject and as such, attribute order is maintained. Note that MarshallerProperties. javainterviewpoint“. ajax android angular api button c++ class database date dom dynamic exception file function html http image input java javascript jquery json laravel list mysql object oop ph php phplaravel phpmysql phpphp post python sed select spring sql string text time url view windows wordpress. By default they are serialized as the name of enum value, but this in some cases one need to proceed in a different way, for example by serializing the underlying numeric value, or by using the toString() method instead of name(). Java JSON Processing API is not very user friendly and doesn’t provide features for automatic transformation from Json to Java object and vice versa. Files with File Extension JSON store Javascript structured information. hash references. If you know the schema in advance, use the version that specifies the schema to avoid the extra scan. How jsonschema2pojo maps format values to Java types:. " The pairs for JSON are at the right. Converting JSON To Map With Java 8 Without Dependencies. The Jackson ObjectMapper can parse JSON from a string, stream or file, and create a Java object or object graph representing the parsed JSON. When comparing JSON to XML, it has several advantages over the last one. JSON is a useful data serialization and messaging format. While creating java class to map to and from JSON we must keep a default constructor because Jackson API creates java class instance using default constructor. Once you load data sources and targets, then drag and drop to define data mappings, filters, and processing functions. We will go through many screenshots and step-by-step examples to demonstrate JSON File or REST API integration in Informatica PowerCenter. LinkedHashMap. JSON parsers are common in most programming languages, because they map directly to objects, conversely XML doesn’t have a natural document-to-object mapping. 1 Installation. Since JSON will be in the form of Key Value pairs it can be easily converted to Java map. "}"] 我这串json转换成List过不去. Map, Number and java. I want to map below Json data to java object of List> type. mcmeta that describes a Java Edition resource pack and data pack‌ [Java. com about deserialization of JSON into polymorhpic types in Java, I couldn't find a simple and complete example using Jackson. Spring MVC - Mapping JSON body data of HTTP PUT request to Java Object [Updated: Feb 22, 2018, Created: Feb 22, 2018] Previous Page Next Page. config : Defines strategies and policies for customizing the mapping between Java program elements and JSON documents. You can vote up the examples you like and your votes will be used in our system to generate more good examples. There are many JSON libraries for Java. Convert Map to JSON array: The following example shows how to convert a map to a JSON array. A get method returns a value if one can be found, and throws an exception if one cannot be found. JSON to Java Code Generator Free code generator which converts your JSON (JavaScript Object Notation) schema into Java Object. Because GSON uses reflection to determine how the fields in our classes map to the serialized JSON, we don’t need to annotate the messages. Launching GitHub Desktop If nothing happens, download GitHub Desktop and try again. Create an Object with this values in map chain to return new array Next step deep copy the array of object to new object. Since Java objects are only understood by Java applications we need to convert the java object to JSON when creating a web service for the android app. This example demonstrate how to parse JSON from OpenWeatherMap to search weather of London, UK. See this topic for the definitions of information items and fields in [square. Check if your JSON is correct, if not find out why with just one click. We might often be dealing with JSON in our projects, where we want some data to be returned from Java as an AJAX response. While creating java class to map to and from JSON we must keep a default constructor because Jackson API creates java class instance using default constructor. Following is a simple example to encode a JSON object using Java JSONObject which is a subclass of java. Below, I've inserted my JSON String, and my two classes. In this Boon JSON Parser tutorial, we will learn how to Convert JSON to Java object and Convert Java Object to JSON again using Boon API. 3 and CXF 3. These examples are extracted from open source projects. The main classes are: org. How to Query JSON with JSONPath? Different strategies to query JSON object and JSON Array. Type the actual name of the Java object that you convert to Json. Steve Hannah, created a pretty cool set of tools to map POJO's (plain old Java objects) to JSON structures by using compile time object mapping. Boon is not a JSON parsing project. I can see a need for both converters - HTML to JSON and JSON to HTML! Now, do you know of an actual HTML to JSON converter?. If you need the strict ordering of elements, use JSONValue. This post will demonstrate same POJO to JSON Data-binding example using commonly used Jackson JSON Annotations. JsonMapObject which is a simple Map wrapper. json”, and write out the descriptions for each project. Download source code here : http://chillyfacts. The goal of J2J is simply the generation of JSON from Java and mapping exiting JSON back again to native Java objects. This example demonstrate how to parse JSON from OpenWeatherMap to search weather of London, UK. You have a JSON string that represents an array of objects, and you need to deserialize it into objects you can use in your Scala application. hash references. Annotate any Java class then use JsonWriter to emit JSON from java or JsonReader to convert JSON to java objects. Fortunately, in Axis2, the user has the freedom of specifying the content type to use. How to convert XML to JSON in Java. In this tutorial we are going to learn how to parse JSON in android using different ways, using java. Parse JSON for Java using org. How to convert map to json in Java How to convert map to json in Java Hi, I my program I have an object of HashMap and I have to output this into json string. The file pack. You need to override either the the nameForField method or the nameForGetterMethod depending on whether you have public field in the bean or a getter in the bean. URI instead of java. Our goal is to provide a Hibernate JSON Type that works for any type of JSON Java Object and on any relational database that supports JSON columns. If you are using Jackson to unmarshal json to a list of map/pojo, you can now specify this by setting useList="true" or use the org. So, if Java can read JSON strings very easy and RPG can write JSON strings very easy then this makes a good combination for data exchange between RPG and Java. Boon JSON is FAST! In addition it has a very easy to use, convention. JSON Utils is a site for generating C#, VB. Sending data to the cloud is a common task in mobile applications. Follow this tutorial to integrate connectivity to JSON services into a Java-based ORM framework, Hibernate. IMHO since ST says it should be passing a map, they should just convert the JSON object into a map and pass it to the method which will avoid this issue in the first place. This write-up focuses on understanding the Jackson ObjectMapper class – and how to serialize Java objects into JSON and deserialize JSON string into Java objects. JSON-P is a lower-level API that provides two models (streaming and object) for JSON processing and transformation. It needs to take a data dump. J2J provides an intuitive way to convert Java to JSON and JSON to Java. Converting between JSON and XML Json. Given Map of String & object (Map), we would like to convert Map to/from JSON. Sending data to the cloud is a common task in mobile applications. Code for reading and generating JSON data can be written in any programming language. How to convert map to json in Java How to convert map to json in Java Hi, I my program I have an object of HashMap and I have to output this into json string. When converting JSONObject / JSONArray to a customized Map or Collection, they would be mapped to. This post will demonstrate same POJO to JSON Data-binding example using commonly used Jackson JSON Annotations. JsonParser reads JSON file and JsonGenerator writes java object or map into JSON file using coded object. Add this in your Configuration file : That’s it, now if you pass json string to the spring controller, it will be converted into java POJO. Luckily we have some alternative APIs that we can use for JSON processing. ch function also can convert 'some. a subset of the JavaScript object notation syntax data stored in name/value pairs records separated by commas field names & strings are wrapped by double quotes YAML. class); 论坛 java 把 List 集合 转 换为 json 01-19 阅读数 5万+. URI instead of java. JsonParser reads JSON file and JsonGenerator writes java object or map into JSON file using coded object. Jackson - Serialize a String Wrapper class. If you need the strict ordering of elements, use JSONValue. mcmeta that describes a Java Edition resource pack and data pack‌ [Java. Do not forget to check for latest dependency at maven site. ObjectMapper; import java. annotation: Defines annotations for customizing the mapping between Java program elements and JSON documents. 16 Converting Objects to and from JSON Documents. If you know the schema in advance, use the version that specifies the schema to avoid the extra scan. JSON can represent two structured types: objects and arrays. Web services are taking over the world. JSONObject is a subclass of java. The following are top voted examples for showing how to use org. Step 3: Convert JSON to Java Map. In Minecraft, JSON format is used to store the following data: Text in written books, signs, custom names and the /tellraw, /title, and /bossbar‌ [Java Edition only] commands. parse, generate, transform and query) JSON messages. Perl hash references become JSON objects. Make sure you have included all apache-commons, apache-logging, apache-discovery (and many other apache packaged required by json) and json-lib in your classpath. How to convert hashmap to json in Java? You can also write Java code for creating the JSON String yourself but its time consuming process and may end up with bugs. As there is no inherent ordering in hash keys (or JSON objects), they will usually be encoded in a pseudo-random. How to convert map to json in Java? Thanks Hi, You have to use the Google Gson library. In this tutorial we are going to learn how to parse JSON in android using different ways, using java. The Map values are serialized using the defaults unless you override them. The implementation was introduced in Java EE 7. when to prefer one over the other JSON. The Jackson ObjectMapper class (com. JAXB and java. In android, application uses JSON to transmit data over networks and JSON data is parsed, while it is received from cloud servers and from some where else. e JsonParser and JsonGenerator. Learn default and customized mappings for JSON-B and see it in action in a JAX-RS web application, in this course with instructor and developer Ketkee Aryamane. While the in Codename One is pretty useful for many things it still requires a proxy and Servlet container which might not be the right choice for everyone. Java API for JSON. For example, if you have a JSON key named timestamp, set this parameter to {"ts": "timestamp"} to map this key to a column named ts. Converting JSON to/from Java Maps using JACKSON API Step 1: Include JACKSON dependency in pom. Do not forget to check for latest dependency at maven site. Spring MVC using annotations is great for AJAX + JSON until you need to customise the JSON mapping. There are many JSON libraries for Java. Accordingly, the json library exposes the dump () method for writing data to files. Jackson is a very popular and efficient java based library used to map java objects to json. Before you start, there is a Nuget package. One value in the map could be a string, and another could be an array. You can use Gson it is an open source library to deal with JSON. JSON parsers are common in most programming languages, because they map directly to objects, conversely XML doesn’t have a natural document-to-object mapping. You don't have to create all these types manually. parseArray(jsonData, Map. There are a number of ways to convert a Java Map into JSON. Given its prevalence and impact. You need to override either the the nameForField method or the nameForGetterMethod depending on whether you have public field in the bean or a getter in the bean. In the examples above we always used bytes and strings as intermediates between the data and JSON representation on standard out. The example uses the stream() method along with map and reduce. Launching GitHub Desktop If nothing happens, download GitHub Desktop and try again. YAML vs JSON. annotation: Defines annotations for customizing the mapping between Java program elements and JSON documents. Elements, attributes, text, comments, character data, processing instructions, namespaces, and the XML declaration are all preserved when converting between the two. For this tutorial we will create a standalone maven project in Eclipse. How to convert hashmap to json in Java? You can also write Java code for creating the JSON String yourself but its time consuming process and may end up with bugs. " with the value of "MN. JSON_NAMESPACE_PREFIX_MAPPER is a JSON-only property; XML unmarshalling can obtain the namespace information from the document itself. Java API for JSON. A JSON array is an ordered collection of values. With Gson the class responsible for serializing from Java to JSON and deserializing from JSON to Java is named, logically enough, Gson. you will also learn different forms of storing data in JSON. I am having the same problem, getting errors of "org. JAVA mapping for JSON object Oct 15, 2014 at 09:55 AM | 160 Views. Convert JSON schema to Java classes using maven plugin Introduction. This example is very useful while printing JSON in log files to differentiate it from other String outputs. simple - JAVA Mapping - JSON. stands for YAML ain't markup language and is a superset of JSON - Convert YAML to JSON. While working with JSON in Android App using RestAPI, I have to do again and again a boring job: create entity class, call RestAPI & get JSON result, then manually mapping JSON object to entity. Strict mode representations of BSON types conform to the JSON RFC. It's not required to save and share code. Actually, I meant HTML to JSON conversion. This parameter takes values of type string. [code] /* * SendRequestForData * */ public void sendRequestForData() { final ProgressDialog progressDialog = new ProgressDialog(t. JSON (JavaScript Object Notation) is a lightweight, text-based, language-independent data exchange format that is easy for humans and machines to read and write. The presence of jsconfig. HashMap where no ordering is provided. However, sometimes we need to handle dynamic JSON objects, which have unknown properties. Jackson is a very popular and efficient java based library used to map java objects to json. Include Jackson 2 dependency in your application project. Validate JSON against Schema in Java. LinkedHashMap. Patient -> Patient REST API JSON Output-> NewModuleConverter JSON to FHIR JSON -> FHIR Patient output I had look at the rest module of openmrs. Sending data to the cloud is a common task in mobile applications. You just need to add it to your message converters. A Java class that uses the @JsonSetter annotation is this. Replacing all stubs with the import If you want to ensure that the only stubs loaded after the import has completed are the ones it contains, you can set "deleteAllNotInImport": true in the JSON or call. readValue(json, Map. Good deal of the code is ported from dsljson, and jsonparser. This write-up focuses on understanding the Jackson ObjectMapper class - and how to serialize Java objects into JSON and deserialize JSON string into Java objects. tv Code Shrinking Techniques with Jakarta EE and MicroProfile--Devoxx. NOTE: Above example pretty formats the JSON data. String str = g. com site has. The following are top voted examples for showing how to use org. JSON has the advantage that is can be used to directly access the geonames webservice from javascript code, whereas using XML the browser will throw a security exception if an xml call to another webserver is made. Given Map of String & object, serialize map of String and user defined objects or POJOs to/from JSON in java using Google GSON (with example). simple example-read and write JSON GSON example-read and write JSON Jackson example - read and write JSON Jackson Streaming API - read and write JSON reading and writing JSON using json-simple. JSON-P is a lower-level API that provides two models (streaming and object) for JSON processing and transformation. You can use Google's GSON parser. The original json. JSON-B is a standard binding layer for converting Java objects to/from JSON messages. It needs to take a data dump. IOException; parse. types from JSON Schema PHP php-code-builder (MIT) - generates PHP mapping structures defined by JSON schema using swaggest/json-schema supports Draft 7. Working with predefined JSON data structures with Jackson is straightforward. Jackson - Serialize a String Wrapper class. While programming we may come across a situation where we have to convert json to xml or vice versa. simple, java json encode, java json encode using map, java json array encode, java json array encode using List, java json decode. These are the steps you need to use to call and get results from server-side code using ICALLBACK. Only implementation is needed. json allows players to set certain game options that have not yet been added to the menu. Serializing JSON. So I had to make a small modification to the JSONObject class. Files with File Extension JSON store Javascript structured information. json has classes to parse Json for Java. Launching GitHub Desktop If nothing happens, download GitHub Desktop and try again. Let's say the mobile app is a hybrid app where the front end is handled by android view and the data transactions are sent through its own web services using JSON. It defines a default mapping algorithm for converting existing Java classes to JSON, while enabling developers to customize the mapping process through the use of Java annotations. For XML to JSON and JSON to XML conversion, MapForce supports any-to-many data mapping as well as chained mappings. The Jackson ObjectMapper can parse JSON from a string, stream or file, and create a Java object or object graph representing the parsed JSON. For example with Java you can do as shown below:. Mapping Between JSON and the XML Infoset. We will create Person class & we will perform following operations with Person class. We were using mongodb to store the feed so I was looking for a simple solution. To start viewing messages, select the forum that you want to visit from the selection below. toJSONString (map) method i. As a data-exchange format, it is widely used in web programming. These libraries can be used in any Java/J2EE project including Servlet, Struts, JSF, JSP etc and JSON data can be created. But Gson allows to exclude certain fields for serialization and deserialization. How to convert map to json in Java How to convert map to json in Java Hi, I my program I have an object of HashMap and I have to output this into json string. The @JsonSetter annotation tells Jackson to deserialize the JSON into Java object using the name given in the setter method. GSON is an open source Java library to serialize and deserialize Java objects to (and from) JSON. class) to convert a JSON string to a Map Check out complete Jackson tutorial at Java Jackson JSON Tutorial with Examples. 16 Converting Objects to and from JSON Documents. Convert JSON to Map or Map to Json in Java Harshit java May 16, 2014 August 20, 2017 1 Minute One of the common uses cases while working with json is to convert it to a java object or convert java object to json. JAXB and java. Here we show how to parse JSON data in Java using the org. MessagePack is an efficient binary serialization format. In Jackson json map example example, we will learn to convert json to map object and then we will learn to convert java map to json. These examples are extracted from open source projects. json implementation has already been included in Android SDK. ObjectMapper) is the simplest way to parse JSON with Jackson. Contribute to ashwindmk/Java-Json-Mapper development by creating an account on GitHub. Tags: import net. Loads a JSON file (one object per line) and returns the result as a DataFrame. TextMarshaler. This post will demonstrate same POJO to JSON Data-binding example using commonly used Jackson JSON Annotations. javainterviewpoint “. This is on purpose. If you know the schema in advance, use the version that specifies the schema to avoid the extra scan. This example demonstrate how to parse JSON from OpenWeatherMap to search weather of London, UK. I am having the same problem, getting errors of "org. Java JSON Processing API is not very user friendly and doesn’t provide features for automatic transformation from Json to Java object and vice versa. json”, and write out the descriptions for each project. JSON_NAMESPACE_PREFIX_MAPPER is a JSON-only property; XML unmarshalling can obtain the namespace information from the document itself. Since there are a variety of JSON libraries for Java (Jackson, GSON, json-lib, etc. What can you do with JSON TO JAVA CONVERTER ? This tool will help you to convert your JSON String/Data to JAVA Class Object ; To Save and Share this code, use Save and Share button. You can use it to map a JSON RPC command from a webservice on an object, creating a more generic service. If you program in Java and use jackson as a serialization library, you may have noticed that enums are a bit tricky. Because JSON is derived from the JavaScript programming language, it is a natural choice to use as a data format in JavaScript. The Jackson ObjectMapper is responsible for mapping the JSON data to the POJOs. GSON: It is an open-source Java library which is used to serialize and deserialize Java objects to JSON. Creates a JSON Document that will validate against a JSON Schema. The second method uses a more complete CSV parser with support for quoted fields and commas embedded within fields. Once you load data sources and targets, then drag and drop to define data mappings, filters, and processing functions. To understand how the mapping happens. Now methods are no longer reuseable and one needs to explicitly handle JSONObject. Jackson data binding example – Map & JSON Example to convert Java Map to / from JSONJackson Tree Model example Read JSON into Tree, like DOM […]. Java map to json. We were using mongodb to store the feed so I was looking for a simple solution. Data binding is a JSON processing model that allows for seamless conversion between JSON data and Java objects. Learn default and customized mappings for JSON-B and see it in action in a JAX-RS web application, in this course with instructor and developer Ketkee Aryamane. Jars Required To Work With JSON In Java Applications Json » on Feb 1, 2012 { 10 Comments } By Sivateja T he following jars are required in order to work with JSON in Java programs. jar (75 kb) Use JSONObject class to create JSON data in Java. Strict mode representations of BSON types conform to the JSON RFC. In this quick article, I will show how to convert a JSON string to Java Map using the Jackson library. This online tool allows you to convert an XML file into a JSON file. LinkedHashMap. path' to JM. The open-source hibernate-types project allows you to map Java objects or Jackson JsonNode as JPA or Hibernate entity properties, and, thanks to our awesome contributors, we have added support for storing type-safe JSON collections. We will use the jackson's objectmapper to serialize Map to JSON & deserialize JSON to Map. The fact-checkers, whose work is more and more important for those who prefer facts over lies, police the line between fact and falsehood on a day-to-day basis, and do a great job. Today, my small contribution is to pass along a very good overview that reflects on one of Trump’s favorite overarching falsehoods. Namely: Trump describes an America in which everything was going down the tubes under  Obama, which is why we needed Trump to make America great again. And he claims that this project has come to fruition, with America setting records for prosperity under his leadership and guidance. “Obama bad; Trump good” is pretty much his analysis in all areas and measurement of U.S. activity, especially economically. Even if this were true, it would reflect poorly on Trump’s character, but it has the added problem of being false, a big lie made up of many small ones. Personally, I don’t assume that all economic measurements directly reflect the leadership of whoever occupies the Oval Office, nor am I smart enough to figure out what causes what in the economy. But the idea that presidents get the credit or the blame for the economy during their tenure is a political fact of life. Trump, in his adorable, immodest mendacity, not only claims credit for everything good that happens in the economy, but tells people, literally and specifically, that they have to vote for him even if they hate him, because without his guidance, their 401(k) accounts “will go down the tubes.” That would be offensive even if it were true, but it is utterly false. The stock market has been on a 10-year run of steady gains that began in 2009, the year Barack Obama was inaugurated. But why would anyone care about that? It’s only an unarguable, stubborn fact. Still, speaking of facts, there are so many measurements and indicators of how the economy is doing, that those not committed to an honest investigation can find evidence for whatever they want to believe. Trump and his most committed followers want to believe that everything was terrible under Barack Obama and great under Trump. That’s baloney. Anyone who believes that believes something false. And a series of charts and graphs published Monday in the Washington Post and explained by Economics Correspondent Heather Long provides the data that tells the tale. The details are complicated. Click through to the link above and you’ll learn much. But the overview is pretty simply this: The U.S. economy had a major meltdown in the last year of the George W. Bush presidency. Again, I’m not smart enough to know how much of this was Bush’s “fault.” But he had been in office for six years when the trouble started. So, if it’s ever reasonable to hold a president accountable for the performance of the economy, the timeline is bad for Bush. GDP growth went negative. Job growth fell sharply and then went negative. Median household income shrank. The Dow Jones Industrial Average dropped by more than 5,000 points! U.S. manufacturing output plunged, as did average home values, as did average hourly wages, as did measures of consumer confidence and most other indicators of economic health. (Backup for that is contained in the Post piece I linked to above.) Barack Obama inherited that mess of falling numbers, which continued during his first year in office, 2009, as he put in place policies designed to turn it around. By 2010, Obama’s second year, pretty much all of the negative numbers had turned positive. By the time Obama was up for reelection in 2012, all of them were headed in the right direction, which is certainly among the reasons voters gave him a second term by a solid (not landslide) margin. Basically, all of those good numbers continued throughout the second Obama term. The U.S. GDP, probably the single best measure of how the economy is doing, grew by 2.9 percent in 2015, which was Obama’s seventh year in office and was the best GDP growth number since before the crash of the late Bush years. GDP growth slowed to 1.6 percent in 2016, which may have been among the indicators that supported Trump’s campaign-year argument that everything was going to hell and only he could fix it. During the first year of Trump, GDP growth grew to 2.4 percent, which is decent but not great and anyway, a reasonable person would acknowledge that — to the degree that economic performance is to the credit or blame of the president — the performance in the first year of a new president is a mixture of the old and new policies. In Trump’s second year, 2018, the GDP grew 2.9 percent, equaling Obama’s best year, and so far in 2019, the growth rate has fallen to 2.1 percent, a mediocre number and a decline for which Trump presumably accepts no responsibility and blames either Nancy Pelosi, Ilhan Omar or, if he can swing it, Barack Obama. I suppose it’s natural for a president to want to take credit for everything good that happens on his (or someday her) watch, but not the blame for anything bad. Trump is more blatant about this than most. If we judge by his bad but remarkably steady approval ratings (today, according to the average maintained by 538.com, it’s 41.9 approval/ 53.7 disapproval) the pretty-good economy is not winning him new supporters, nor is his constant exaggeration of his accomplishments costing him many old ones). I already offered it above, but the full Washington Post workup of these numbers, and commentary/explanation by economics correspondent Heather Long, are here. On a related matter, if you care about what used to be called fiscal conservatism, which is the belief that federal debt and deficit matter, here’s a New York Times analysis, based on Congressional Budget Office data, suggesting that the annual budget deficit (that’s the amount the government borrows every year reflecting that amount by which federal spending exceeds revenues) which fell steadily during the Obama years, from a peak of $1.4 trillion at the beginning of the Obama administration, to $585 billion in 2016 (Obama’s last year in office), will be back up to $960 billion this fiscal year, and back over $1 trillion in 2020. (Here’s the New York Times piece detailing those numbers.) Trump is currently floating various tax cuts for the rich and the poor that will presumably worsen those projections, if passed. As the Times piece reported: