Develop Reference

Cannot instantiate the type ADBDataSource using axis2

After using Eclipse EE and Eclipse Axis2 Code Generator plugin, I got a two
operation generated java files with the same error:
Cannot instantiate the type ADBDataSource ConcatRequest.java
Cannot instantiate the type ADBDataSource ConcatResponse.java
Here is the problem:
org.apache.axiom.om.OMDataSource dataSource = new
org.apache.axis2.databinding.ADBDataSource(this,MY_QNAME);
This code appears in both ConcatRequest.java and ConcatResponse.java and
causes the error. I see that ADBDataSource is abstract and cannot be instantiated.
I'm totally new to Axis and I don't know how to solve this problem. Please help.

I had this problem due to a version mismatch of axis2-adb. Safest way to deal with this problem is to have a look at the lib folder of the eclipse plugin (eclipse/(dropins|plugins)/ ... .jar). Then look for the versions of the dependecies and include them (the ones you actually need) in your build path.

i faced the same issue while generating JAVA Stubs from WSDL. Following are the steps I used to solve the issues :
Follow the below link to generate Stubs : https://support.pcmiler.com/en/support/solutions/articles/19000053078-java-client-axis2-code-generator-for-eclipse.
Now there is a small tweak to this link. After doing point no 10 & 11 as mentioned in the above link , only use axis2-1.7.9 to generate your stubs and when they are generated used the jars mentioned in the \axis2-1.7.9\lib in your build path.
Hope this solves your issue.

Old topic, but I was working on a legacy project with several subprojects.
In one of those subprojects, I came across this same message.
It also was a version problem (Maven dependencies...).
Ctrl-Click (in Eclipse/IntelliJ) on "ADBDataSource". Which version is it? For me it was 1.5.6, but in my pom.xml there was only
<dependency>
<groupId>org.apache.axis2</groupId>
<artifactId>axis2</artifactId>
<version>1.7.4</version>
</dependency>
However, this subproject had a dependency on another subproject which WAS using 1.5.6 (I found it by searching in the whole project for "1.5.6" using the Notepad++ "Search / Find in Files" menu option).
Then in the dependency to that other project, I excluded 1.5.6 :
<dependency>
<groupId>com.group.id</groupId>
<artifactId>anotherproject</artifactId>
<version>version</version>
<exclusions>
<exclusion>
<groupId>org.apache.axis2</groupId>
<artifactId>axis2</artifactId>
</exclusion>
</exclusions>
</dependency>
After adding the exclusion, the project did use the 1.7.4 version.

java.lang.NoSuchFieldError: org.apache.http.message.BasicLineFormatter.INSTANCE from Mashape Unirest in Java application

I have a Maven Java project that uses Mashape Unirest for sending HTTP requests to other URLs. I am currently writing an integration test (using TestNG) that sends a normal HTTP request using Unirest. When I run the integration test through Maven (via the Failsafe plugin), the request is sent out successfully. However, when I try to run the integration test via Eclipse, I keep on getting the following error:
FAILED: getCurrentTimeTest
java.lang.NoSuchFieldError: INSTANCE
at org.apache.http.impl.io.DefaultHttpRequestWriterFactory.<init>(DefaultHttpRequestWriterFactory.java:52)
at org.apache.http.impl.io.DefaultHttpRequestWriterFactory.<init>(DefaultHttpRequestWriterFactory.java:56)
at org.apache.http.impl.io.DefaultHttpRequestWriterFactory.<clinit>(DefaultHttpRequestWriterFactory.java:46)
at org.apache.http.impl.conn.ManagedHttpClientConnectionFactory.<init>(ManagedHttpClientConnectionFactory.java:72)
at org.apache.http.impl.conn.ManagedHttpClientConnectionFactory.<init>(ManagedHttpClientConnectionFactory.java:84)
at org.apache.http.impl.conn.ManagedHttpClientConnectionFactory.<clinit>(ManagedHttpClientConnectionFactory.java:59)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager$InternalConnectionFactory.<init>(PoolingHttpClientConnectionManager.java:487)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.<init>(PoolingHttpClientConnectionManager.java:147)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.<init>(PoolingHttpClientConnectionManager.java:136)
at org.apache.http.impl.conn.PoolingHttpClientConnectionManager.<init>(PoolingHttpClientConnectionManager.java:112)
at org.apache.http.impl.client.HttpClientBuilder.build(HttpClientBuilder.java:726)
at com.mashape.unirest.http.options.Options.refresh(Options.java:41)
at com.mashape.unirest.http.options.Options.<clinit>(Options.java:27)
at com.mashape.unirest.http.HttpClientHelper.prepareRequest(HttpClientHelper.java:141)
at com.mashape.unirest.http.HttpClientHelper.requestAsync(HttpClientHelper.java:80)
at com.mashape.unirest.request.BaseRequest.asStringAsync(BaseRequest.java:56)
at ...
I am also able to reproduce this error using a basic Java application script.
I have made sure that the dependencies I am using in my pom.xml file are the latest and greatest, as seen below:
<dependency>
<groupId>com.mashape.unirest</groupId>
<artifactId>unirest-java</artifactId>
<version>1.3.5</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.3.2</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpasyncclient</artifactId>
<version>4.0</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpmime</artifactId>
<version>4.3.2</version>
</dependency>
<dependency>
<groupId>org.json</groupId>
<artifactId>json</artifactId>
<version>20140107</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpcore</artifactId>
<version>4.3.2</version>
</dependency>
I have also checked out the source code of BasicLineFormatter.java, both from the source file downloaded to Eclipse and from Apache's Httpcore Github repo. In the Github repo, notice how the INSTANCE field is defined for the 4.3.x branch and the trunk branch, but not in older branches like 4.2.x. However, I am indeed using version 4.3.2 in my project, so I should be using a JAR file for Httpcore that has the latest version of BasicLineFormatter. I know that, based on the Maven Dependencies JAR files that are in my project, that I am indeed using the latest versions of these Apache dependencies, not the older versions specified as downstream dependencies of my project.
I have checked other various SOF and blog posts about this issue, such as Mashape Unirest Java : java.lang.NoClassDefFoundError and this blog post too, but they all seem to be talking about solving the NoSuchFieldError problem for Android. However, I'm dealing with a standalone Java application, not an Android application.
I am at a loss in determining how to troubleshoot this issue. Anyone have any idea what I need to do?
UPDATE
Instead of showing my test case, I will reduce the illustration of a reproduction of this problem to just a simple one-liner Java application, because the problem exists with any Java application or test case run through Eclipse, not just one particular test:
System.out.println(Unirest.get("http://www.google.com").asStringAsync().get().getBody());
Normally, this should print the HTML of the Google home page, but I instead get the NoSuchFieldError stack trace.
FIXED!
The problem was that the AWS SDK (it's on my classpath because I'm developing for Elastic Beanstalk) had a conflicting JAR file. Using Oleg's solution (thanks BTW), I printed the following output in a unit test:
jar:file:/some/path/aws-java-sdk/1.7.1/third-party/httpcomponents-client-4.2.3/httpcore-4.2.jar!/org/apache/http/message/BasicLineFormatter.class
I'll have to rearrange my classpath so that AWS SDK is no longer conflicting.

The only plausible explanation to this problem is there is an older version of HttpCore on the classpath (unless you also want to consider a possibility of green men from Mars messing with your computer remotely from a flying saucer).
You can add this snippet to your code to find out what jar the class gets picked up from. This might help find out why that jar is on your classpath in the first place.
ClassLoader classLoader = MyClass.class.getClassLoader();
URL resource = classLoader.getResource("org/apache/http/message/BasicLineFormatter.class");
System.out.println(resource);
This basically tells me that in my case the jar resides in the local maven repository and likely to have been added to the classpath by Maven
jar:file:/home/oleg/.m2/repository/org/apache/httpcomponents/httpcore/4.3.1/httpcore-4.3.1.jar!/org/apache/http/message/BasicLineFormatter.class

As already mentioned by previous comments, It's mainly because of the conflicting versions of httpcore jar, the static field INSTANCE is been added to BasicLineFormatter class in versions > 4.3.1, Though you might have added the latest version of the httpcore jar in your dependencies, but its highly possible that other (lower) version of jar is getting picked up.
So, first to confirm that, wrong jar is getting picked up, Use the following line of code -
ClassLoader classLoader = <Your Class>.class.getClassLoader();
URL resource = classLoader.getResource("org/apache/http/message/BasicLineFormatter.class");
System.out.println(resource);
If this prints, the lower version of the jar, then it's confirmed that it's picking the lower version of the httpcore jar (May be from other dependencies of your project),
Solution -
Add following maven/gradle dependencies at the top of dependency list (Or above the other project dependency which caused the conflict) -
<dependency>
<groupId>com.mashape.unirest</groupId>
<artifactId>unirest-java</artifactId>
<version>1.4.5</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpcore</artifactId>
<version>4.4.1</version>
</dependency>
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.4.1</version>
</dependency>

I faced the same exception using unirest:
java.lang.NoSuchFieldError: INSTANCE
at org.apache.http.impl.io.DefaultHttpRequestWriterFactory.<init>(DefaultHttpRequestWriterFactory.java:52)
at com.mashape.unirest.http.options.Options.refresh(Options.java:55)
at com.mashape.unirest.http.options.Options.<clinit>(Options.java:36)
And found it was due to DefaultConnectionKeepAliveStrategy.INSTANCE; and the conflicting jar was apache-httpcomponents-httpclient.jar in my classpath. Adding this post to help anyone who faces similar exception

I got this Exception: Caused by: java.lang.NoSuchFieldError: INSTANCE
Solution:
This happens if you have two different version classes in your classpath…. […], So I first find that class (one version of class), click that class, select build path, then I click remove from build path.

if you are using aws sdk this error occurs because of dependency mismatch.
To avoid this error do the following:
1.Put the dependecies in the required order aws sdk and the end preferably
2.Add shade plugin to the project
This solved my problem

you can refer to my answer in
HTTPClient Example - Exception in thread "main" java.lang.NoSuchFieldError: INSTANCE
my case is i have httpclient-4.4.1.jar, and httpcore-4.4.1.jar in my class path, but JVM loaded BasicLineFormatter from httpcore-4.0.jar

Broken example in Google Drive SDK quick start documentation

I need to develop an application that would be able to download a given document from Google Drive. I have found out that the recommended technology to use in the Java world is currently the Google Drive SDK.
As described by the quick start guide I have imported the required dependencies to my Maven project like this:
<dependency>
<groupId>com.google.apis</groupId>
<artifactId>google-api-services-drive</artifactId>
<version>v2-rev98-1.17.0-rc</version>
</dependency>
The official sample DriveCommandLine source code (to be found at the bottom of same page) refuses to compile with the following error messages:
The import com.google.api.client.json.jackson cannot be resolved (at DriveCommandLine.java, line 8),
JacksonFactory cannot be resolved to a type (at DriveCommandLine.java, line 27).
How do I fix it? I'm running Java version 1.7.

Apparently you need to import the following dependency as well in order for the code to work. It contains the JacksonFactory class.
<dependency>
<groupId>com.google.http-client</groupId>
<artifactId>google-http-client-jackson2</artifactId>
<version>1.16.0-rc</version>
</dependency>

import org.apache.commons.httpclient.*

I use a code that imports the following package:
import org.apache.commons.httpclient.*;
I use eclipse. I went to http://hc.apache.org/downloads.cgi & I downloaded the Jar files, I added them to my project. Still eclipse making an error for this.
Exception in thread "main" java.lang.Error: Unresolved compilation
problems: HttpClient cannot be resolved to a type
What is the problem?

If you are using the latest (4.x) version of these modules, they have been refactored a lot.
For example, the package name is now org.apache.http.client.
Old sample code will have to be modified.
Look at the Javadocs and the Quickstart for the new project.
The (discouraged) alternative would be to get the old (3.x) version.

I would recommend using Maven for managing your 3rd party dependencies. It takes care of jar files & all related dependencies.
The maven dependency for httpclient is:
<dependency>
<groupId>org.apache.httpcomponents</groupId>
<artifactId>httpclient</artifactId>
<version>4.2.1</version>
<scope>compile</scope>
</dependency>

JAXWS code generation and implementation along side Spring for JDK1.5

We're trying to generate source code stubs from a series of WSDLs (each with their own XSDs). We can do this fine and works perfectly under JDK1.6, however we need it to work under JDK1.5.
We're using jaxws-maven-plugin to generate the source code, however it depends on the wsimport binary being available (this is not available in JDK1.5). We found a work around for this, we can now generate the source code.
The final problem comes when we try and use the compiled stub code with Spring (2.5.6) we're using a JaxWsPortProxyFactoryBean to interface with the generated client code. We get a java.lang.NoClassDefFoundError: javax/xml/ws/soap/Addressing. I investigated why this was and found that the javax.xml.ws/javax-api/2.1 dependency did not contain this class. I upgraded the version number to 2.1-1 and now when we build the project (to generate the source code) we get the following error:
cannot find symbol
symbol : method partName()
location : #interface javax.jws.WebParam
Can anyone provide a solution to this so we can generate our JAXWS client stub code and make it work with the JaxWsPortProxyFactoryBean?
Thanks in advance
Jonathan

It seems that they mess with this jar, see this link.
The workaround is the following :
delete M2_REPO/javax/xml/ws/jaxws-api/2.1/ directory
use this dependency
<dependency>
<groupId>javax.xml.ws</groupId>
<artifactId>jaxws-api</artifactId>
<version>2.1</version>
</dependency>
put these repositories at the top of your list :
<repository>
<id>javanet</id>
<url>http://download.java.net/maven/2/</url>
</repository>
<repository>
<id>javanet legacy</id>
<url>http://download.java.net/maven/1/</url>
<layout>legacy</layout>
</repository>

I managed to solve this one, after hours of studying the dependencies and looking at what each of them had inside I discovered that the dependency javax.xml.ws:jaxws-api:2.1-1 was required, but we had to take a copy of this dependency and take out:
<dependency>
<groupId>javax.jws</groupId>
<artifactId>jsr181</artifactId>
<version>1.0</version>
</dependency>
Then I had to include the following dependency in the pom.xml of my application:
<dependency>
<groupId>javax.jws</groupId>
<artifactId>jsr181-api</artifactId>
<version>1.0-MR1</version>
</dependency>
This is far from ideal, we have to maintain a separate proprietary dependency in our maven repository and remember to include this dependency. The annoying thing is Maven doesn't allow me to exclude by version number (only by groupId and artifactId). If anyone has a suggestion to make this solution better please let me know.
Thanks for your help.

We're using jaxws-maven-plugin to generate the source code, however it depends on the wsimport binary being available (this is not available in JDK1.5). We found a work around for this, we can now generate the source code.
Actually, wsimport, which is part of JAX-WS, is not included in Java 5 (unlike Java 6 which includes JAX-WS 2.x, Java 6u14 includes JAX-WS 2.1.6) but it is available for Java 5 as long as you provide it. The odd part is that the jaxws-maven-plugin declare these dependencies (see for example jaxws-maven-plugin-1.12.pom), there must be a classloading issue somewhere, hence the "work around".
The final problem comes when we try and use the compiled stub code with Spring (2.5.6) we're using a JaxWsPortProxyFactoryBean to interface with the generated client code. We get a java.lang.NoClassDefFoundError: javax/xml/ws/soap/Addressing. [...]
What version of the plugin are you using exactly? I'd suggest to use the version 1.12 and the same version of jax-ws as in the plugin in your pom.xml:
<dependency>
<groupId>com.sun.xml.ws</groupId>
<artifactId>jaxws-tools</artifactId>
<version>2.1.7</version>
</dependency>