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#JAVA DOWNLOAD FAILS HOW TO#
#JAVA DOWNLOAD FAILS WINDOWS#

#JAVA DOWNLOAD FAILS WINDOWS#

On some 32-bit Windows systems, ImageJ may initially request more memory than Windows can handle. If ImageJ does not start up On a fresh installation

Take note of any error messages in the console window, which you can copy and paste it into a bug report.

Perform the same actions which previously resulted in the crash.

Launch ImageJ from the console as described above.

If ImageJ crashes-i.e., the program suddenly terminates, with or without an error message-it is very helpful to identify the steps which can reliably reproduce the crash: you can paste it into a bug report! If ImageJ crashes

Press ↵ Enter to copy it to the clipboard.

Click the Command Prompt icon in the upper left corner of the window, and choose Edit › Mark.

( Note: this shortcut actually uses the Break key) Press ⌃ Ctrl + Pause in the Command Prompt window to print the stack trace.Right click and select “Copy” to copy it to the clipboard.Select the stack trace by dragging with the left mouse button.Press ⌃ Ctrl + \ in the console window to print the stack trace.On Windows, you will need to download and run this batch file, which launches ImageJ with an attached Command Prompt window.Launch ImageJ again, this time from the console as described above.

If the first method does not work, and you can reproduce the hang:

Press ⌃ Ctrl + A to select it, then ⌃ Ctrl + C to copy it to the clipboard.

If successful, it will open a new window with the stack trace. There are two ways to create such a snapshot, known as a “thread dump” or “stack trace”.

#JAVA DOWNLOAD FAILS HOW TO#

This information can give the developers valuable hints about how to fix the problem. If ImageJ appears to hang-i.e., it stops responding to inputs-it is often helpful to take a “snapshot” of where the program is at after the hang occurs. For maximum debugitude, turn on both! If ImageJ freezes or hangs This might reveal different information than using the techniques described above. There is another debug mode, which can be enabled in the Edit › Options › Misc… menu, by checking Debug mode. See the Logging page for more about SciJava logging. Valid levels include: none, error, warn, info, debug and trace. You can control the log level more precisely by setting the system property.

Make a copy of ImageJ-win64.exe called debug.exe.

To diagnose problems with ImageJ, it is often helpful to launch it in debug mode:ĭEBUG=1 /Applications/ImageJ2.app/Contents/MacOS/ImageJ-macosx

See also How do I launch ImageJ with a different version of Java?. On macOS, you can use this script to diagnose which versions of Java are installed on your system. “Java 1.8.0_45” or similar indicates Java 8, while “Java 1.7.0_79” or similar indicates Java 7. The relevant number is the one after “Java 1.”-so e.g. You can tell which Java version ImageJ is using by clicking the ImageJ status bar and looking for the part that says e.g. How to troubleshoot problems Checking the Java version