Latest Java-openjdk upgrade

[Fernando Lozano]

Hi,

I do heavy Java development and never had issues with OpenJDK on Fedora.
And I have OpenJDK on RHEL at many production sites. So don't bother
switching to Oracle Java. Instead try unistall and reinstall OpenJDK
Packages because it looks you have either a corrupted file.

Other option is you have other Java installations besides the
Fedora-provided OpenJDK and you PATH or CLASSPATH have entries for
different installations. This happen a lot when you have both GCJ and
OpenJDK or Oracle Java and OpenJDK. Maybe you left your browser install
Java (from Oracle) instead of configuring the Fedora-provided Java plugin.

Check which java, javac and etc are configured using alternatives and
check you env vars. Make sure you are using commands, jars and libraries
from the same installation.


[]s, Fernando Lozano

>
> Here a link that explains the */java.lang.ClassFormatError/*:
> http://craftingjava.blogspot.co.il/2012/07/reason-for-javalangclassformaterror.html
>
> --------------------
> "*/this error would be thrown when the java virtual machine attempts
> to read a class file and founds that the class file has been altered
> in such a way that it loses its integrity./*"
>
> Here they are trying to say that */"if a class file has been modified
> in a complicated way  then this error would be thrown." /*
>
> There may be two possible ways a class file can get corrupted as far i
> know.
>
> 1.May be the compiler have some unresolved bugs in it.
> 2.The programmer may intentionally change the class file for some reasons.
> ----------------------
>
> In your case this error does not seem to depend on your code.
>
> So, I can suggest you to useOracle JDK instead OpenJDK,this because I
> had some problems using NetBeans and then I got that suggestion, that
> helped me.
>
>
> Angelo
>
> On Tue, Jan 27, 2015 at 1:35 AM, Kevin Cummings
> <cummings at kjchome.homeip.net <mailto:cummings at kjchome.homeip.net>> wrote:
>
>     I updated to java-1.7.0-openjdk.x86_64 1:1.7.0.75-2.5.4.2.fc20 today
>     (along with the java-1.7.0-openjdk-headless and
>     java-1.7.0-openjdk-devel
>     packages).  After the upgrade, nothing java related would run. 
>     (not the
>     compiler, not the jar command, and I couldn't run any pre-built
>     .jars.)
>      The error was:
>
>     > Error occurred during initialization of VM
>     > java/lang/ClassFormatError: Unknown constant tag 99 in class
>     file java/lang/Class
>
>     Downgrading back to java-1.7.0-openjdk.x86_64
>     1:1.7.0.60-2.4.3.0.fc20 et
>     al fixed the problem.
>
>     --
>     Kevin J. Cummings
>     kjchome at verizon.net <mailto:kjchome at verizon.net>
>     cummings at kjchome.homeip.net <mailto:cummings at kjchome.homeip.net>
>     cummings at kjc386.framingham.ma.us
>     <mailto:cummings at kjc386.framingham.ma.us>
>     Registered Linux User #1232 (http://www.linuxcounter.net/)
>     --
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>
>
>

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