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Excelsior JET 4.5 Maintenance Pack 4 Download

Excelsior JET 4.5 Maintenance Pack 4 (MP4) is a highly recommended update that fixes multiple customer issues. It supersedes Maintenance Pack 3 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 most important issues resolved in Excelsior JET 4.5 Maintenance Pack 4 are as follows:

    JET-2441 The substring "\n" interpreted as CRLF (or NEWLINE) in jetvmprop (-Dmy.Prop) after packing

    JET-2454 Academic edition banner removed from test run in JET Control Panel

    JET-2526 Compiler error: invalid index at line 215 of opCode.ob2

    JET-2532 ASSERT(FALSE,15) at line 746 of rfDFG.ob2

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

    JET-2542 JET Control Panel does not compile projects on systems with more than 2Gb physical memory

    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-2531 Runtime error #16173

    JET-2656 Console window pops up during installation on Windows 98

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

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

Linux Specific

    JET-2701 Crash during timezone detection

Download Instructions

If you are a registered customer of Excelsior JET 4.5, but have not received a user/password combination for MP4 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 Enterprise jet-450-mp4-ent-en-win32.exe Password Required
Professional jet-450-mp4-pro-en-win32.exe Password Required
Standard jet-450-mp4-std-en-win32.exe Password Required
Linux Enterprise jet-450-mp4-ent-en-linux.bin Password Required
Professional jet-450-mp4-pro-en-linux.bin Password Required
Standard jet-450-mp4-std-en-linux.bin Password Required

Installation Instructions

MP4 installs on top of the original Excelsior JET 4.5, possibly with previous hotfixes applied. If you need to make a fresh installation, install Excelsior JET 4.5 first, cancel JET Setup, and apply MP4.

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 MP4 does obsolete your current profiles. 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 MP4. 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 MP4 later without installing it. Select Manage JET Updates and click Redo until it displays the current configuration as "jet-450-mp4".


  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.

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