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Java

Java profiling

https://www.youtube.com/watch?v=4TTgrRPnvno

Java 8: Stream Style

http://w.on24.com/r.htm?e=807818&s=1&k=467E0D659F4695078A17A3F17A73C441

JSR (Java Specification Request)

Documents describing proposed additions to the Java platform

Start application and make thread dump

java -agentlib:hprof=cpu=samples,depth=100,interval=20,lineno=y,thread=y,file=your_dump_name.hprof -jar your-jar-name.jar

Get java process ids

jps

Get thread pool

jstack

Heap dump in case of OOM error

java -XX:+HeapDumpOnOutOfMemoryError MainClass

Switch on debug of SSL in Java

http://itech-notes.blogspot.com/2013/02/javaxnetdebug-ssl-java.html

java -Djavax.net.debug=SSL,handshake,data,keymanager,trustmanager -jar ...

Include one XML into another

<include resource="by/andd3dfx/mdclogging/mdc-pattern.xml"/>

JVisualVM error: "jvisualvm can not locate Java installation"

https://stackoverflow.com/questions/59538974/jvisualvm-can-not-locate-java-installation

You have 2 options:

  • Launch bin/visualvm.exe at the command line with the --jdkhome parameter and your JDK location 
    visualvm.exe --jdkhome "c:\\Program Files\\Java\\jdk-11.0.13"
  • Update the visualvm_jdkhome variable in the file etc/visualvm.conf of your JVisualVM directory

JVisualVM error: redefinition failed with error 62 while trying to profile an application

https://stackoverflow.com/questions/26834651/redefinition-failed-with-error-62-while-trying-to-profile-an-application

In VM arguments, add -Xverify:none

To add breakpoint for exception by condition - put next text into Condition field:

this instanceof java.lang.ClassCastException

OpenJDK General-Availability Releases

https://jdk.java.net/archive/