what does each of these options mean?

Question

java -Djava.library.path=../lib 
     -classpath ../lib/wrappertest.jar:../lib/wrapper.jar:Service.jar:../lib/mysql-connector-java-3.0.17-ga-bin.jar 
     -Dwrapper.key=Ksxtsmvr7iAmVJ-T 
     -Dwrapper.port=32001 
     -Dwrapper.jvm.port.min=31000 
     -Dwrapper.jvm.port.max=31999 -Dwrapper.pid=1731 
     -Dwrapper.version=3.3.0 
     -Dwrapper.native_library=wrapper 
     -Dwrapper.service=TRUE 
     -Dwrapper.cpu.timeout=10 
     -Dwrapper.jvmid=1 
           org.tanukisoftware.wrapper.WrapperSimpleApp com.jobirn.Service

Answer 1

-classpath sets the class path for the JVM, i.e. the path where it will look for classes. The others (starting with -D ) all set System properties. Of these, java.library.path sets the path where the JVM will look for native libraries. The other system properties are used to configure the Java Service Wrapper product.

Answer 2

-classpath tells the VM how to find classes

-Dx=y sets the system property x to value y; the exact effect depends on the property:

• java.library.path is used to find native libraries
• The rest (wrapper.*) looks like it's read by a third party library.