java.lang.UnsupportedClassVersionError: Bad version number in .class file error while calling web service -


i getting following error while using web service.

500 internal server error

java.lang.unsupportedclassversionerror: bad version number in .class file     @ java.lang.classloader.defineclass1(native method)     @ java.lang.classloader.defineclass(classloader.java:620)     @ java.security.secureclassloader.defineclass(secureclassloader.java:124)     @ com.evermind[oracle application server containers j2ee 10g (10.1.2.3.0)].util.oc4jsecureclassloader.defineclassentry(oc4jsecureclassloader.java:172)     @ com.evermind[oracle application server containers j2ee 10g (10.1.2.3.0)].naming.contextclassloader.defineclass(contextclassloader.java:1179)     @ com.evermind[oracle application server containers j2ee 10g (10.1.2.3.0)].naming.contextclassloader.defineclass(contextclassloader.java:1065)     @ com.evermind[oracle application server containers j2ee 10g (10.1.2.3.0)].naming.contextclassloader.findclass(contextclassloader.java:404)     @ java.lang.classloader.loadclass(classloader.java:306)     @ com.evermind[oracle application server containers j2ee 10g (10.1.2.3.0)].naming.contextclassloader.loadclass(contextclassloader.java:143)     @ java.lang.classloader.loadclass(classloader.java:299)     @ com.evermind[oracle application server containers j2ee 10g (10.1.2.3.0)].naming.contextclassloader.loadclass(contextclassloader.java:143)     @ java.lang.classloader.loadclass(classloader.java:299)     @ java.lang.classloader.loadclass(classloader.java:251)     @ oracle.j2ee.ws.javarpcwebservice.init(javarpcwebservice.java:85)     @ javax.servlet.genericservlet.init(genericservlet.java:258)     @ com.evermind[oracle application server containers j2ee 10g (10.1.2.3.0)].server.http.httpapplication.loadservlet(httpapplication.java:2358)     @ com.evermind[oracle application server containers j2ee 10g (10.1.2.3.0)].server.http.httpapplication.findservlet(httpapplication.java:4800)     @ com.evermind[oracle application server containers j2ee 10g (10.1.2.3.0)].server.http.httpapplication.getrequestdispatcher(httpapplication.java:2826)     @ com.evermind[oracle application server containers j2ee 10g (10.1.2.3.0)].server.http.httprequesthandler.processrequest(httprequesthandler.java:666)     @ com.evermind[oracle application server containers j2ee 10g (10.1.2.3.0)].server.http.ajprequesthandler.run(ajprequesthandler.java:231)     @ com.evermind[oracle application server containers j2ee 10g (10.1.2.3.0)].server.http.ajprequesthandler.run(ajprequesthandler.java:136)     @ com.evermind[oracle application server containers j2ee 10g (10.1.2.3.0)].util.releasableresourcepooledexecutor$myworker.run(releasableresourcepooledexecutor.java:192)     @ java.lang.thread.run(thread.java:595) 

i have seen earlier posts couldn't find solution this. source files present on different server , web service deployed on different server. can find out causing issue ?

this due lower java version on system. means jar or java file importing in project compiled on higher version of java.


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