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Exception UnsupportedClassVersionError Thrown

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By: Eric Tam - hy_tam

Exception UnsupportedClassVersionError Thrown

2005-02-06 18:56

i am a beginner of using iReport, when i start the iReport with iReport.bat, i've got an exception UnsupportedClassVersionError thrown, following is the screen dump


Exception in thread "main" java.lang.UnsupportedClassVersionError: it/businesslo

gic/ireport/gui/MainFrame (Unsupported major.minor version 48.0)

at java.lang.ClassLoader.defineClass0(Native Method)

at java.lang.ClassLoader.defineClass(ClassLoader.java:488)

at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:10


at java.net.URLClassLoader.defineClass(URLClassLoader.java:243)

at java.net.URLClassLoader.access$100(URLClassLoader.java:51)

at java.net.URLClassLoader$1.run(URLClassLoader.java:190)

at java.security.AccessController.doPrivileged(Native Method)

at java.net.URLClassLoader.findClass(URLClassLoader.java:183)

at java.lang.ClassLoader.loadClass(ClassLoader.java:294)

at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:281)

at java.lang.ClassLoader.loadClass(ClassLoader.java:250)

at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:310)


Do anybody have idea of this problem?


jdk version: 1.3.1_07

iReport version: 0.4.1


Many Thanks,




By: Jte - jte_rem

RE: Exception UnsupportedClassVersionError Thrown

2005-03-03 08:09

yes the problem here is that the version of JasperReports that you are using is not compatible with the JDK version that you are working from. You may need to download an older version of JasperReports to solve the problem. Or else upgrade to a new version of the JDK



By: Kees Kuip - keeskuip

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