Java Commands

java_commands.txt

heap dump:
jmap -dump:format=b,file=heap.bin <pid>

thread dump:
jstack -l JAVA_PID > jstack.out
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# java links:
https://www.reucon.com/cdn/java/
http://ghaffarian.net/downloads/Java/JDK/

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# Generate javadoc from package
# javadoc -d <output_folder> -sourcepath <folder path which java packages are in it> -subpackages <package_name>
$ javadoc -d ~/tempfiles/javadoc -sourcepath java -subpackages ir

# enabling/disabling assertion:
-enableassertions or -ea
-disableassertions or -da
# enabling / disabling assertion for package, class
$ java -ea:com.wombat.fruitbat -da:com.wombat.fruitbat.Brickbat BatTutor 
# assetion for system classes:
-enablesystemassertions, or -esa
-disablesystemassertions, or -dsa

# jvm parameters
thread stack size: -Xss512k (default is 1024k)
-Xms1024m
-Xmx1024m