I have a gradle task which starts a java project. Basically like this:
gradle run -PmainClass=package.path.ServiceMain
Now, I want to increase the heap for the java process started by gradle because the standard heap size is too small. The problem is that I succeed only to increase the size of the gradle process, not the size of the java process which is launched by the gradle project. I check the heap size with this command in my Java code:
Runtime.getRuntime().totalMemory()
I tested this check and it is valid to use it like this. But it shows me that gradle starts my Java process always with the same heap size.
I experimented with these options:
DEFAULT_JVM_OPTS='-Xmx1024m -Xms512m'
GRADLE_OPTS='-Xmx1024m -Xms512m'
JAVA_OPTS='-Xmx1024m -Xms512m'
No success.
I also tried this:
gradle run -PmainClass=package.path.ServiceMain -DXmx1024m -DXms512m
Still, no success.
Of course, I already searched the web but I found only some hints saying that I could modify the build.gradle file. Unfortunately, this is not what I want/can.
I need to specify the java heap size for my java program on the command line when starting it by a gradle run task (due to the actual project structure).
Thanks in advance for support. Any help is appreciated.
As @Opal states above it is not possible.
The easiest/simplest alternative I could find (for now) is to add this little snippet to the build.gradle file:
tasks.withType(JavaExec) {
jvmArgs = ['-Xms512m', '-Xmx512m']
}
Alternatively, the environment variable _JAVA_OPTIONS can be used. Thanks @ady for the hint.