Using jasperstarter to compile and run iReport "java.lang.UnsupportedClassVersionError"

Question

Basically what I want to do is create a PDF from a iReport jrxml or jasper file.

The idea is to use this for reports over the net and the best solution I managed to find was to use a program like jasperstarter and then run the report with a connection to MSSQL database.

To get the connection going I had to download the latest net.sourceforge.jtds.jdbc.Driver.

The report works fine using iReport 5.1 but when I do follow the instructions from jasperstarter I get an "java.lang.UnsupportedClassVersionError" response.

jasperstarter command

jasperstarter pr -t generic -f pdf -i test_report.jasper -o test -u username -p       password --db-driver net.sourceforge.jtds.jdbc.Driver --db-url jdbc:jtds:sqlserver://LOCAL-PC/Demo_DB

output

Exception in thread "main" java.lang.UnsupportedClassVersionError: net/sourcefor
ge/jtds/jdbc/Driver : Unsupported major.minor version 51.0
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClassCond(Unknown Source)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$000(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.Class.forName0(Native Method)
        at java.lang.Class.forName(Unknown Source)
        at de.cenote.jasperstarter.Db.getConnection(Db.java:69)
        at de.cenote.jasperstarter.Report.fill(Report.java:220)
        at de.cenote.jasperstarter.App.processReport(App.java:222)
        at de.cenote.jasperstarter.App.main(App.java:107)

Please advice.

possible duplicate of [unsupported major.minor version 51.0](http://stackoverflow.com/questions/10382929/unsupported-major-minor-version-51-0) — Stephen C, May 10 '13 at 09:52

Stephen C · Answer 1 · 2019-10-19T01:45:08.700

1

Basically, you are trying to run code that was compiled on / for Java 7 on an older JVM.

That doesn't work.

Either:

run your application on a Java 7 JVM (or later¹); i.e. upgrade your Java version,
find a build of the JDTS driver that is suitable for your execution platform, or
find the source for the JDTS driver and build it for your platform.

For more detailed information on this exception and its causes, read:

http://stackoverflow.com/questions/10382929.

^{1 - Note that even Java 7 is end-of-life now. If you are still running that version of Java you should upgrade.}

edited Oct 19 '19 at 01:45

answered May 10 '13 at 09:55

Stephen C

698,415
94
811
1,216

Thanks for the advice. I had to un-install everything and redo it by using the latest versions. That solved my problem. – RiaanSA May 13 '13 at 11:31

score 0 · Answer 2 · answered May 13 '13 at 11:34

0

Make sure you have same JRE and JDK.

If not sure un-install download the latest JDK and try again.

Note that the JDK does install the JRE automatically.

answered May 13 '13 at 11:34

RiaanSA

11
1
2

Using jasperstarter to compile and run iReport "java.lang.UnsupportedClassVersionError"

jasperstarter command

output

2 Answers2