java lang UnsupportedClassVersionError Unsupported major minor version 51 0

Question

I am trying to build an application  but it gives some error  My JDK version is given below   java version  1 6 0 30  Java TM  SE Runtime Environment  build 1 6 0 30-b12  Java HotSpot TM  Client VM  build 20 5-b03  mixed mode  sharing    Here is my Error Log   Buildfile  build xml  compile        echo  Compiling the service           echo       mkdir for classes first           echo       java classes next           echo       mkdir for generated code next           echo      generate stubs skeletons next      wscompile  command line  wscompile -d  home vivekray program MTrans WEB-INF classes -features wsi documentliteral -gen server -keep -model  home vivekray program MTrans WEB-INF model gz -verbose -Xprintstacktrace  home vivekray program MTrans src config xml -classpath  home vivekray program MTrans WEB-INF  home vivekray program MTrans WEB-INF classes  home vivekray program MTrans lib log4j-1 2 16 jar  home vivekray jwsdp-2 0 jwsdp-shared lib mail jar  home vivekray jwsdp-2 0 jwsdp-shared lib activation jar  home vivekray jwsdp-2 0 jaxp lib jaxp-api jar  home vivekray jwsdp-2 0 jaxp lib endorsed dom jar  home vivekray jwsdp-2 0 jaxp lib endorsed sax jar  home vivekray jwsdp-2 0 jaxp lib endorsed xalan jar  home vivekray jwsdp-2 0 jaxp lib endorsed xercesImpl jar  home vivekray jwsdp-2 0 jaxrpc lib jaxrpc-api jar  home vivekray jwsdp-2 0 jaxrpc lib jaxrpc-spi jar  home vivekray jwsdp-2 0 jaxrpc lib jaxrpc-impl jar  home vivekray jwsdp-2 0 saaj lib saaj-api jar  home vivekray jwsdp-2 0 saaj lib saaj-impl jar  home vivekray jwsdp-2 0 jwsdp-shared lib relaxngDatatype jar  home vivekray jwsdp-2 0 jwsdp-shared lib xsdlib jar  home vivekray jwsdp-2 0 jwsdp-shared lib jax-qname jar  home vivekray jwsdp-2 0 apache-ant lib ant jar  home vivekray jwsdp-2 0 fastinfoset lib FastInfoset jar  home vivekray Softwares apache-tomcat-7 0 27 lib servlet-api jar  wscompile   creating model  mtransservice   wscompile   creating service  Mtransservice   BUILD FAILED java lang UnsupportedClassVersionError  in cdac mobile computing mtrans MtransService   Unsupported major minor version 51 0     at java lang ClassLoader defineClass1 Native Method      at java lang ClassLoader defineClassCond ClassLoader java 631      at java lang ClassLoader defineClass ClassLoader java 615      at org apache tools ant AntClassLoader defineClassFromData AntClassLoader java 1146      at org apache tools ant AntClassLoader getClassFromStream AntClassLoader java 1324      at org apache tools ant AntClassLoader findClassInComponents AntClassLoader java 1388      at org apache tools ant AntClassLoader findClass AntClassLoader java 1341      at org apache tools ant AntClassLoader loadClass AntClassLoader java 1088      at java lang ClassLoader loadClass ClassLoader java 295      at java lang ClassLoader loadClass ClassLoader java 247      at java lang Class forName0 Native Method      at java lang Class forName Class java 247      at com sun xml rpc processor modeler rmi RmiUtils getLoadableClassName RmiUtils java 78      at com sun xml rpc processor modeler rmi RmiUtils getRealName RmiUtils java 54      at com sun xml rpc processor modeler rmi RmiModeler modelPort RmiModeler java 676      at com sun xml rpc processor modeler rmi RmiModeler buildLiteralModel RmiModeler java 603      at com sun xml rpc processor modeler rmi RmiModeler buildModel RmiModeler java 457      at com sun xml rpc processor config ModelInfo buildModel ModelInfo java 88      at com sun xml rpc processor Processor runModeler Processor java 63      at com sun xml rpc tools wscompile CompileTool run CompileTool java 714      at com sun xml rpc util ToolBase run ToolBase java 43      at com sun xml rpc tools ant Wscompile execute Wscompile java 746      at org apache tools ant UnknownElement execute UnknownElement java 288      at sun reflect GeneratedMethodAccessor3 invoke Unknown Source      at sun reflect DelegatingMethodAccessorImpl invoke DelegatingMethodAccessorImpl java 25      at java lang reflect Method invoke Method java 597      at org apache tools ant dispatch DispatchUtils execute DispatchUtils java 106      at org apache tools ant Task perform Task java 348      at org apache tools ant Target execute Target java 357      at org apache tools ant Target performTasks Target java 385      at org apache tools ant Project executeSortedTargets Project java 1337      at org apache tools ant Project executeTarget Project java 1306      at org apache tools ant helper DefaultExecutor executeTargets DefaultExecutor java 41      at org apache tools ant Project executeTargets Project java 1189      at org apache tools ant Main runBuild Main java 758      at org apache tools ant Main startAnt Main java 217      at org apache tools ant launch Launcher run Launcher java 257      at org apache tools ant launch Launcher main Launcher java 104   Total time  1 second

User · Accepted Answer

java lang UnsupportedClassVersionError happens because of a higher JDK during compile time and lower JDK during runtime   Here s the list of versions   Java SE 9   53  Java SE 8   52  Java SE 7   51  Java SE 6 0   50  Java SE 5 0   49  JDK 1 4   48  JDK 1 3   47  JDK 1 2   46  JDK 1 1   45

User · Answer

Make sure you re using the correct SDK when compiling running and also  make sure you use source target 1 7

User · Answer

I encountered the same issue  when jdk 1 7 was used to compile then jre 1 4 was used for execution    My solution was to set environment variable PATH by adding pathname C  glassfish3 jdk7 bin in front of the existing PATH setting  The updated value is  C  glassfish3 jdk7 bin C  Sun SDK bin   After the update  the problem was gone

User · Answer

It means that you compiled your classes under a specific JDK  but then try to run them under older version of JDK

User · Answer

These guys gave you the reason why is failing but not how to solve it  This problem may appear even if you have a jdk which matches JVM which you are trying it into   Project -  Properties -  Java Compiler  Enable project specific settings   Then select Compiler Compliance Level to 1 6 or 1 5  build and test your app   Now  it should be fine

User · Answer

Use Maven and use the maven-compiler-plugin to explicitly call the actual correct version JDK javac exe command  because Maven could be running any version  this also catches the really stupid long standing bug in javac that does not spot runtime breaking class version jars and missing classes methods properties when compiling for earlier java versions   This later part could have easily been fixed in Java 1 5  by adding versioning attributes to new classes  methods  and properties  or separate compiler versioning data  so is a quite stupid oversight by Sun and Oracle

User · Answer

Version 51 is Java 7  you probably use the wrong JDK  Check JAVA HOME   As mentioned here  under Binary Compatibility

[java] java.lang.UnsupportedClassVersionError Unsupported major.minor version 51.0

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