java - Jar file too big -

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i created simple project using windowbuilder in eclipse , goal send email. don't know kind of computer person using, exported project 'runnable jar file' , checked option 'extract required libraries generated jar'.

the problem generated jar file 20mb in size!!! project has 1 simple window - nothing complicated or fancy.

i found people use proguard include needed.

i know if there way optimize 'manually'? there libraries automatically included when creating windowbuilder project, , how may determine libraries can remove?

thank you.

i've had same problem using windowbuilder. solution imports in .java file, e.g.: import org.eclipse.swt.swt; in project explorer in eclipse can see there more imports needed. 'build paths' can removed carefully. rightclick on .jar import "com.ibm.icu_52.1.0.v201404241930.jar" , click on "build path" , "remove build path". unfortunately, can't remove or delete packages inside .jars. using method, managed reduce size 20.7mb 3.87mb. it's something...


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