[GRADLE-2992] Application plugin should reduce risk of producing a script that exceeds Windows command length limit Created: 20/Jan/14  Updated: 10/Feb/17  Resolved: 10/Feb/17

Status: Resolved
Project: Gradle
Affects Version/s: None
Fix Version/s: None

Type: Bug
Reporter: Gradle Forums Assignee: Unassigned
Resolution: Won't Fix Votes: 12


The script could additively build the classpath and not explicitly pass a -cp argument to `java`, instead relying on it picking up the CLASSPATH var.

As pointed out in the linked post, there are limits on environment variable length so there is still a boundary there.

Comment by Jesse Eichar [ 31/Mar/14 ]

If the java to be used is going to be Java 6 or higher the class path can be:


See http://docs.oracle.com/javase/6/docs/technotes/tools/windows/classpath.html

look at the section on wildcards.

The targetCompatibility and sourceCompatibility can be used to see if the Java is Java 6+

My 2 cents

Comment by Mike M. [ 23/Apr/15 ]

I think a pathing jar would be a good and flexible solution that works on any jdk: See http://stackoverflow.com/a/201969/737587

Comment by Mike M. [ 23/Apr/15 ]

I wrote a workaround. It generates such a pathing jar and applies it in the windows cmd file:

// Fix command-length issue in windows startscript
task pathingJar(type: Jar) {
    appendix = 'pathing'
    manifest { attributes("Class-Path": configurations.runtime.collect { it.getName() }.join(' ') + ' ' + jar.archiveName ) }
applicationDistribution.from(pathingJar) { into "lib" }
startScripts {
    doLast {
        def winScriptFile  = file getWindowsScript()
        def winFileText = winScriptFile.text

        // Remove too-long-classpath and use pathing jar instead
        winFileText = winFileText.replaceAll('set CLASSPATH=.*', 'rem CLASSPATH declaration removed.')
        winFileText = winFileText.replaceAll('("%JAVA_EXE%" .* -classpath ")%CLASSPATH%(" .*)', '$1%APP_HOME%\\\\lib\\\\' + pathingJar.archiveName + '$2')

        winScriptFile.text = winFileText
Comment by Amit [ 03/Sep/15 ]

My workaround solution for this ,( works for java 6 and above only)


{ // Remove too-long-classpath and use wildcard ( works for java 6 and above only) windowsScript.text = windowsScript.text.replaceAll('set CLASSPATH=.*', 'set CLASSPATH=.;%APP_HOME%/lib/*') }


Comment by Michel Krämer [ 22/Jan/16 ]

> I wrote a workaround. It generates such a pathing jar and applies it in the windows cmd file:


Comment by David Burns [ 27/Feb/16 ]

Also +1 for the pathing jar solution - if order of jars is not important, then the wildcard is probably fine. For me order was important and so wildcard solution gave different results.

Comment by Benjamin Muschko [ 15/Nov/16 ]

As announced on the Gradle blog we are planning to completely migrate issues from JIRA to GitHub.

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Comment by Benjamin Muschko [ 10/Feb/17 ]

Thanks again for reporting this issue. We haven't heard back from you after our inquiry from November 15th. We are closing this issue now. Please create an issue on GitHub if you still feel passionate about getting it resolved.

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