Java.lang.InternalError: jzentry == 0 after long idle time

Question

Hi,
Our J2Se 1.4.1 Client/Server application works fine.
However, after a long period of inactivity on the Windows 2000 client side (one hour or two, like during lunch), the icons in the toolbars have vanished and be replaced by black.
Some other times, I get an internal error:
java.lang.InternalError: jzentry == 0,
jzfile = 9641264,
total = 2427,
name = L:\xxx\yyy\ourapplication.jar,
i = 1,
message = couldn't read LOC header
It seems as if the memory content was swapped out and the classes loaded in the heap were lost due to some timeout.
Can someone explain the phenomenon and propose a solution to this annoying behaviour?
Jean-Pierre

Answer 1

I have a similar (if not iqual) problem. The diferense is that I'm using XP and not 2000 edition.
the error "begin" when I do my first Ctrl+Spacebar.... I think that eclipse begin to load the super classes, but stops because of some reason, that I dont know..
what is LOC header? is that an JVM problem? I think so because of the error message witch apears after that long time waitng:
"Virtual machine error jas occurred
You are recommended to exit the workbench
Subsequent errors may happen and may terminate the workbench without warring.
here is my .log file:
!SESSION Abr 30, 2004 14:16:25.932 ---------------------------------------------
java.version=1.4.2_04
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=pt_BR
Command-line arguments: -os win32 -ws win32 -arch x86
!ENTRY org.eclipse.core.resources 2 1 Abr 30, 2004 14:16:25.932
!MESSAGE Skipping builder for project Model. Either the builder is missing from the install, or it belongs to a project nature that is missing or disabled.
!ENTRY org.eclipse.ui 4 4 Abr 30, 2004 14:35:10.329
!MESSAGE Unhandled event loop exception
!ENTRY org.eclipse.ui 4 0 Abr 30, 2004 14:35:10.339
!MESSAGE jzentry == 0,
jzfile = 50349248,
total = 1049,
name = \\xxx\yyy\zzz\Model\lib\fop.jar,
i = 54,
message = couldn't read LOC header
!STACK 0
java.lang.InternalError: jzentry == 0,
jzfile = 50349248,
total = 1049,
name = \\xxx\yyy\zzz\Model\lib\fop.jar,
i = 54,
message = couldn't read LOC header
     at java.util.zip.ZipFile$2.nextElement(Unknown Source)
     at org.eclipse.jdt.internal.core.JarPackageFragmentRoot.computeChildren(JarPackageFragmentRoot.java:84)
     at org.eclipse.jdt.internal.core.PackageFragmentRoot.buildStructure(PackageFragmentRoot.java:173)
     at org.eclipse.jdt.internal.core.Openable.generateInfos(Openable.java:200)
     at org.eclipse.jdt.internal.core.JavaElement.openWhenClosed(JavaElement.java:488)
     at org.eclipse.jdt.internal.core.JavaElement.getElementInfo(JavaElement.java:280)
............