Excelsior Logo Home

Excelsior JET 4.1 Maintenance Pack 2 Download

Excelsior JET 4.1 Maintenance Pack 2 (MP2) is a highly recommended update that fixes multiple customer issues. It supersedes Maintenance Pack 1 and incorporates all hotfixes you may have received from Excelsior Technical Support prior to June 26, 2007.

WARNING: Maintenance Packs fix particular problems reported by Excelsior JET users and discovered by Excelsior test engineers after the release of the respective version of the product. They are tested on a representative subset of the test suite used during preparation of the original release. We therefore only recommend you to install Maintenance Packs in the following cases:

  • You have been advised to do so by an Excelsior support engineer;
  • You need to switch to a Java SE (micro)version supported through a Maintenance Pack;
  • You want to try a new technology from Excelsior that requires installation of a particular Maintenance Pack; or
  • You are experiencing a severe problem, such as compiler or application crash or incorrect application behavior.

Release Notes

The fatal runtime error message is corrected to instruct the end user to contact the vendor of the application. The new property jet.runtime.error.message enables customization of the runtime error message.

The most important issues resolved in Excelsior JET 4.1 Maintenance Pack 2 are as follows:

    JET-402 Excelsior JET may hang forever during compilation with CPU usage 0% due to not enough memory for the compiler.

    JET-2103 xjava -Xcompile crashes if slashes are used in main class name

    JET-2087 Some bound resources are not visible if there are conflicts

    JET-2092 Compiler crash "Fault 450 - compilation aborted: ASSERT"

    JET-2111, JET-2088 Trap #3 crash during JIT compilation. Appears on Hibernate 3.1

    JET-2115 Typos in messages of JET GUI tools

    JET-2185 Memory leak in Java strings creation routine (JNI_NewString as well)

    JET-2343 java.io.FileOutputStream appends to file incorrectly

    JET-2539 Thread.getStackTrace() is implemented for the current thread

    JET-2569 Runtime error during reallocation of large objects

    JET-2578 String constants not initialized in interfaces compiled by fast JIT

    JET-2723, JET-2726 OutOfMemoryError/trap/hangs on multi-CPU systems

    JET-2736 Occasional OutOfMemoryError

    JET-2779 Some java.lang.StrictMath methods may yield wrong results

    JET-2861 java.lang.SecurityException: sealing violation

    JET-3198 java.nio.charset.Charset.availableCharsets() does not return extended charsets

    JET-3211 Bugs in sun.misc.Unsafe put/get methods (certain methods don't actually get/put values)

Windows Specific

    JET-2109 File.lastModified() does not work for root directories, like C: on Windows NT/2000/XP/2003 systems

    JET-2118 JET GUI tools hang on startup on some Windows installations

    JET-2122, JET-2180 Wrong localization of buttons in message boxes

    JET-2288 "imagebase" equation could not be read by LaunchPad

    JET-2408 JIT runtime DLLs are lost after converting old .jpn (before 4.0) projects to 4.1 ones

    JET-2134 Hang during application exit if HP tools are installed

    JET-2482 NullPointerException/runtime error #3 on systems with DEP enabled

    JET-2531 Runtime error #16173

    JET-2670 Resources not found if application launched from UNC path

    JET-2768 xjava.exe now expands wildcards in command line

Linux Specific

    Extra property jet.append.classpath.env is introduced

    JET-976 Shutdown hooks don't work

    JET-2114 Excelsior JET and JetPackII crash on startup with obsolete message when screen resolution is too small on Linux

    JET-2701 Crash during timezone detection

Download Instructions

If you are a registered customer of Excelsior JET 4.1 Standard or Professional Edition, but have not received a user/password combination for MP2 download, request it from our Support Dept. at support@excelsior-usa.com.

Depending on the platform and Excelsior JET Edition you are using, click one of the download links below:

Platform Edition Download
Windows Professional jet-410-mp2-pro-en-win32.exe Password Required
Standard jet-410-mp2-std-en-win32.exe Password Required
Linux Professional jet-410-mp2-pro-en-linux.bin Password Required
Standard jet-410-mp2-std-en-linux.bin Password Required

Installation Instructions

MP2 installs on top of the original Excelsior JET 4.1, possibly with previous hotfixes applied. If you need to make a fresh installation, install Excelsior JET 4.1 first, cancel JET Setup, apply MP2, and then use JET Setup to create profiles.

To update an existing Excelsior JET installation, launch the downloaded executable and follow the on-line prompts. Upon successful copying of Maintenance Pack files, JET Setup will launch automatically and apply the Maintenance Pack.

Profile Management

Installation of MP2 obsoletes your current JET profiles, if any. You will have to refresh them before you may continue using Excelsior JET. Those profiles are backed up by JET Setup. If you rollback to the previous update level, they will be restored.

The procedure of profile refresh is as follows:


JET Setup is launched automatically upon successful installation of MP2. Select the profile that you want refreshed and click Refresh.


  1. Run JET Setup to display the list of profiles:
      jetsetup -show-profiles
  2. Locate in the list the outdated profile(s) that you need to refresh and write down their numeric indexes.
  3. For each profile index in your list, run JET Setup as follows:
      jetsetup -refresh-profile profile

    where profile is the profile index.

Update Management


To rollback to the previous update level, select Manage JET Updates in Excelsior JET Start Menu and click Undo.

Rollback does not remove the installed updates and associated profiles, so you can reapply MP2 later without installing it. Select Manage JET Updates and click Redo until it displays the current configuration as "jet-410-mp2".


  1. Run JET Setup to display the list of installed updates:
      jetsetup -show-updates
  2. Locate in the list the updates which you need to activate. Then run JET Setup again as follows:
      jetsetup -activate-update list

    where list is a colon-separated list of update names.

  3. Display the list of profiles available for the new combination of updates: jetsetup -show-profiles
  4. If necessary, create new profiles.

Home | Company | Products | Services | Resources | Contact

Store | Downloads | Support | Forum | Blog | Sitemap

© 1999-2015 Excelsior LLC. All Rights Reserved.