Unsupported class version error in java?

Question

I'm trying to pass some response parameters using Android to a java web application. I'm using jdk 1.6_32 for android development and jdk1.5_06 on server side. Parameters which I'm trying to pass are login credentials(String) and png file which is Base64 encoded to string. Login credentials are being passed correctly but, when png file is being passed, server is throwing following exception:

15:08:33,264 ERROR [[ImageRetrieve]] Servlet.service() for servlet ImageRetrieve threw exception
java.lang.UnsupportedClassVersionError: Bad version number in .class file
    at java.lang.ClassLoader.defineClass1(Native Method)
    at java.lang.ClassLoader.defineClass(ClassLoader.java:620)
    at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
    at org.apache.catalina.loader.WebappClassLoader.findClassInternal(WebappClassLoader.java:1629)
    at org.apache.catalina.loader.WebappClassLoader.findClass(WebappClassLoader.java:850)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1299)
    at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1181)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
    at com.apd.test.ImageRetrieve.doPost(ImageRetrieve.java:46)
    at com.apd.test.ImageRetrieve.doGet(ImageRetrieve.java:37)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:697)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
    at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
    at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
    at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:153)
    at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
    at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
    at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
    at java.lang.Thread.run(Thread.java:595)

I'm unable to figure out the issue.

Answer 1

Seems like you are using some class that was compiled with JDK6 on the server (which runs on JDK5). All classes on the server must be compiled against JDK5 for your setup to work correctly.