java.lang.NoClassDefFoundError: com/google/api/client/json/JsonFactory

Question

I constantly get this error when I deploy locally my GAE project. When I try to access the API Explorer I get the following:

WARNING: Error for /_ah/spi/BackendService.getApiConfigs
java.lang.NoClassDefFoundError: com/google/api/client/json/JsonFactory
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:274)
    at com.google.api.server.spi.ServletInitializationParameters.getClassForName(ServletInitializationParameters.java:82)
    at com.google.api.server.spi.ServletInitializationParameters.fromServletConfig(ServletInitializationParameters.java:51)
    at com.google.api.server.spi.SystemServiceServlet.init(SystemServiceServlet.java:102)
    at org.mortbay.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:440)
    at org.mortbay.jetty.servlet.ServletHolder.getServlet(ServletHolder.java:339)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:127)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:125)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366)
    at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349)
    at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:98)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:491)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)
Caused by: java.lang.ClassNotFoundException: com.google.api.client.json.JsonFactory
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at com.google.appengine.tools.development.IsolatedAppClassLoader.loadClass(IsolatedAppClassLoader.java:216)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    ... 42 more

and a second error:

WARNING: /_ah/api/discovery/v1/apis: java.io.IOException: Failed to retrieve API configs with status: 500
Jan 26, 2015 10:16:57 AM com.google.apphosting.utils.jetty.JettyLogger warn
WARNING: /_ah/spi/BackendService.getApiConfigs
java.lang.NullPointerException
    at com.google.api.server.spi.SystemServiceServlet.execute(SystemServiceServlet.java:147)
    at com.google.api.server.spi.SystemServiceServlet.doPost(SystemServiceServlet.java:118)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
    at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:511)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1166)
    at com.google.appengine.api.socket.dev.DevSocketFilter.doFilter(DevSocketFilter.java:74)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.ResponseRewriterFilter.doFilter(ResponseRewriterFilter.java:127)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.HeaderVerificationFilter.doFilter(HeaderVerificationFilter.java:34)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.api.blobstore.dev.ServeBlobFilter.doFilter(ServeBlobFilter.java:63)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.apphosting.utils.servlet.TransactionCleanupFilter.doFilter(TransactionCleanupFilter.java:43)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.StaticFileFilter.doFilter(StaticFileFilter.java:125)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectRequest(DevAppServerModulesFilter.java:366)
    at com.google.appengine.tools.development.DevAppServerModulesFilter.doDirectModuleRequest(DevAppServerModulesFilter.java:349)
    at com.google.appengine.tools.development.DevAppServerModulesFilter.doFilter(DevAppServerModulesFilter.java:116)
    at org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1157)
    at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:388)
    at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
    at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:182)
    at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:765)
    at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:418)
    at com.google.appengine.tools.development.DevAppEngineWebAppContext.handle(DevAppEngineWebAppContext.java:98)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at com.google.appengine.tools.development.JettyContainerService$ApiProxyHandler.handle(JettyContainerService.java:491)
    at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
    at org.mortbay.jetty.Server.handle(Server.java:326)
    at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:542)
    at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:938)
    at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:755)
    at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:218)
    at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:404)
    at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:409)
    at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:582)

It seems to me that the problem is a dependency but I have already removed most of them but the absolutely nececcery. Any clues?

EDIT: Adding pom

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>SocialGeek-AppEngine</groupId>
    <artifactId>SocialGeek-AppEngine</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <build>
        <sourceDirectory>src</sourceDirectory>
        <resources>
            <resource>
                <directory>src</directory>
                <excludes>
                    <exclude>**/*.java</exclude>
                </excludes>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <dependency>
            <groupId>com.google.api.client</groupId>
            <artifactId>google-api-client</artifactId>
            <version>1.4.1-beta</version>
        </dependency>
        <dependency>
            <groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-core-asl</artifactId>
            <version>1.9.11</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.1.3</version>
        </dependency>
        <dependency>
            <groupId>com.google.http-client</groupId>
            <artifactId>google-http-client</artifactId>
            <version>1.11.0-beta</version>
        </dependency>

    </dependencies>
</project>

I am facing the same issue, did you finally solve it? – Parag Kadam Aug 10 '16 at 10:50 — Parag Kadam, Aug 10 '16 at 10:50

Max Worg · Answer 1 · 2015-01-26T18:44:51.963

2

Double check that you have all of the dependencies that are listed here

The 500 error is likely due to the fact that the server can't be reached. Double check that your --address=0.0.0.0 --port=8888 parameter values point to the correct end point.

In your pom file you are using old, beta version for some of the Google APIs that might be trying to use the older version of the JSON/Jackson libraries. Try forcing the latest versions by changing the values to recent version. Here is an updated pom to try:

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>SocialGeek-AppEngine</groupId>
    <artifactId>SocialGeek-AppEngine</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <build>
        <sourceDirectory>src</sourceDirectory>
        <resources>
            <resource>
                <directory>src</directory>
                <excludes>
                    <exclude>**/*.java</exclude>
                </excludes>
            </resource>
        </resources>
        <plugins>
            <plugin>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.1</version>
                <configuration>
                    <source>1.7</source>
                    <target>1.7</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
    <dependencies>
        <dependency>
            <groupId>com.google.api.client</groupId>
            <artifactId>google-api-client</artifactId>
            <version>1.18.0</version>
        </dependency>
        <dependency>
            <groupId>org.codehaus.jackson</groupId>
            <artifactId>jackson-core-asl</artifactId>
            <version>1.9.11</version>
        </dependency>
        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.1.3</version>
        </dependency>
        <dependency>
            <groupId>com.google.http-client</groupId>
            <artifactId>google-http-client</artifactId>
            <version>1.18.0</version>
        </dependency>

    </dependencies>
</project>

If we start to inspect the error message closely we see that the error code is 500 and typically a 500 HTTP error is due to an Internal Server Error which means that the server accepted the request but there was a problem in processing the request. Make sure that you built your project (using Maven) with the correct application ID that corresponds with the project.

You will also want to double check that you are not using Java 8 since GAE only fully supports Java 7 right now.

edited Jan 26 '15 at 18:44

answered Jan 26 '15 at 11:09

Max Worg

2,932
2
20
35

1

I do not use JacksonFactory at all, so there is no need to import anything. I did get pom to fetch these dependencies and import them to the project but the problem unfortunately remains. – George Daramouskas Jan 26 '15 at 11:24
Is this for Android or a standalone Java app? – Max Worg Jan 26 '15 at 11:27
Edit: I can confirm that the `NoClassDefFoundError` is resolved but the NPE exception remains. It is a backend to an android app. – George Daramouskas Jan 26 '15 at 11:28
Updated my answer - NPE may be caused due to `--address=` and/or `--port=` values pointing to the incorrect endpoint. – Max Worg Jan 26 '15 at 11:31
I have already configured the address and port the way you mentioned and the NPE remains. – George Daramouskas Jan 26 '15 at 11:40
Fixed the NPE by regenerating Cloud Endpoint Client library but the `java.lang.NoClassDefFoundError: com/google/api/client/json/JsonFactory` is back again... – George Daramouskas Jan 26 '15 at 11:44
Please post your pom file. – Max Worg Jan 26 '15 at 11:49
Added POM file. Yes the application is listening on the port because when I navigate to `http://localhost:8888` I get the index page. – George Daramouskas Jan 26 '15 at 11:53
Updated my answer. You were calling old, beta versions of the Google API libraries which might be looking for older versions of the JSON/Jackson code. Try with the new pom file and let's go from there. – Max Worg Jan 26 '15 at 12:01
I copied the POM file exactly but I was getting a `missing artifact` error on `com.google.api.client` and `com.google.http-client`. I browsed the mvn repositories and managed to find a release version to include. I am still getting the same error... – George Daramouskas Jan 26 '15 at 17:59
I updated my answer (at the bottom) with a few more things to try. Make sure that your maven command was correct when building the project (since you are getting a 500 error is says that Google didn't like something on their end) and that you are using Java 7 since Java 8 is not supported yet. – Max Worg Jan 26 '15 at 18:46
I am using OpenJdk7. I disabled Maven nature and starting copying the jars to the `libs` folder. Now I have `java.lang.ClassNotFoundException: com.google.api.client.json.gson.GsonFactory` instead of JsonFactory. – George Daramouskas Jan 26 '15 at 18:52

score 0 · Answer 2 · answered Jan 26 '15 at 11:07

0

You're correct in thinking this is a dependency issue. You need to find the jar file that contains the missing class and add it to your classpath.

answered Jan 26 '15 at 11:07

Paul Hunnisett

898
1
17
36

Any clues from the stacktrace I provided as of which one could it be? – George Daramouskas Jan 26 '15 at 11:22

java.lang.NoClassDefFoundError: com/google/api/client/json/JsonFactory

2 Answers2

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