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Bugs in Earlier Versions

On this page we will describe bugs that are solved in the current release of Renew. If one of these bugs occurs at your site, you should upgarde your installation.

You can also read about bugs in the current version.

Java compiler hangs during compilation of Renew

Description: When trying to build Renew from its sources, the Java compiler hangs and will not continue.

Environments: Java 1.1.3, but may affect other early Java 1.1 versions.

Cause: A Java bug regarding inner classes.

Remedy: Use Renew 1.1 or later versions.

Renew hangs on start with explicit drawing

Description: When Renew is started with a command line parameter or by double-clicking a drawing (which is about the same thing), the Renew window is displayed but then it locks up.

Environments: OS/2 Warp 4.

Cause: Again some AWT bug in the ScrollPane, specific to OS/2.

Remedy: Use Renew 1.1 or later versions.

Renew cannot handle null objects properly

Description: In several contexts, the Java null object is not handled correctly. This ranges from internal exceptions and bad screen output to illegally disabled transitions.

Environments: All.

Cause: Simulation engine.

Remedy: Use Renew 1.1 or later versions.

Trace flag is not saved to disk.

Description: After setting the trace mode of a net element to false, saving the net drawing to disk, and reloading it, the trace disk is set to true again.

Environments: All.

Cause: Renew.

Remedy: Use Renew 1.1 or later versions.

Renew does not compile under Java 1.2

Description: Compiling Renew under Java 1.2 results in deprecation and error messages.

Environments: Java 1.2.

Cause: Due to some changes in the Java API it is difficult at this point of time to create a version Renew that compiles under Java 1.1 as well as under Java 1.2. Since Java 1.2 is not yet available for all platforms, we decided to keep Renew compatible with Java 1.1 for the time being.

Remedy: In Renew 1.2 the required changes to the sources are documented.

Transition with empty preset is disabled

Description: A transition that has no preconditions will fire once, but never twice when using the sequential simulator.

Environments: All.

Cause: Simulation engine.

Remedy: Corrected in Renew 1.2.

Memory leaks when using nested tuples

Description: When using nested tuples it is possible that not all garbage is properly recognized. This bug has not yet been observed in the wild, it requires a very peculiar situation.

Environments: All.

Cause: Simulation engine.

Remedy: Corrected in Renew 1.2.

Transitions without input arcs become disabled

Description: When simulating a transition without input arcs, the simulation engine might declare them disabled. This happens only in the sequential simulator.

Environments: All.

Cause: Simulation engine.

Remedy: Corrected in Renew 1.2.

Toolbar window remains empty

Description: After the start of Renew the main toolbar window remains empty. It shows neither the tool buttons, nor the status line.

Environments: Linux/Java 1.1.5/FVWM, but may affect others.

Cause: Some AWT implementations seem to have a problem with windows that are not resizeable, but only in combination with certain window managers.

Remedy: Starting with Renew 1.4, the main window is resizable.

Toolbar window jumps off screen

Description: After the start of Renew the main toolbar window appears for a short period of time, but then quickly jumps to a different position, which is possibly off the screen and not reachable.

Environments: Solaris/Java 1.2/TVM, but may affect others.

Cause: Some AWT implementations seem to have a problem with windows that are not resizeable, but only in combination with certain window managers.

Remedy: Starting with Renew 1.4, the main window is resizable.

Spurious dots during drag

Description: When dragging around text figures, Renew displays some spurious dots on the screen.

Environments: Sun/Solaris, Java 1.2.2

Cause: Java Virtual Machine.

Remedy: This seems to be a Java bug. The only known remedy is to use another virtual machine.

Renew startup script fails with NoClassDefFoundError or ZipException

Description: The renew startup script fails and produces output like one of the following examples:

  • Exception in thread "main" java.lang.NoClassDefFoundError: someWord
  • Exception in thread "main" java.util.zip.ZipException: file or directory not found

Environments: Windows, Unix and MacOS X.

Cause: This is a bug in our startup scripts of release 2.0, they cannot handle spaces in directory names.

Workaround: Install Renew 2.0 to a directory path without spaces, and don't run the scripts from a current directory where the path contains spaces.

Remedy: The bug has been fixed with release 2.0.1

Drawing window stops updating after dragging figures beyond the visible area

Description: After moving figures outside the drawing window boundaries, the elements are not repainted. Any other subsequent operation on the drawing has no visible effect, either. Nevertheless, the changes are actually applied to the drawing.

Environments: All.

Workaround: Resize the window or use the scroll bars to refresh the window contents.

Remedy: This bug has been fixed with release 2.0.1.

Mouse garbles screen output

Description: When moving the mouse over Renew windows, the screen becomes garbled.

Environments: Windows 32.

Cause: This is an AWT bug that appears if you use a software mouse cursor, in most cases if you have installed Windows Plus! and activated some "desktop theme".

Remedy: Switch off the software mouse cursor in the mouse control panel. Set it to "Windows standard".

GUI hangs when closing instance windows

Description: When closing a net instance window while the simulation is active, the graphical user interface occasionally ceases to respond to any input. Typically in such case there are highlighted transitions visible.
This bug can also occur when windows are closed during simulation termination.

Environments: All

Cause: A deadlock between the simulation event mechanism and the user interface can occur due to a race condition.

Workaround: Always halt the simulation before closing net instance windows or terminating it.

Remedy: This bug has been fixed with release 2.1.

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Last modified: Fri Jul 25 17:03:23 CEST 2008 by webmaster@renew.de