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Is there a way to disable restrictions of javac 1.6.0_22 that prevent me from using JRE internal classes like sun.awt.event.* ?
I'm not looking for:
I just want to know if it is possible or not, and if it is then how.
532
The javac command reads source files that contain module, package and type declarations written in the Java programming language, and compiles them into class files that run on the Java Virtual Machine. The javac command can also process annotations in Java source files and classes.
Technically, javac is the program that translates Java code into bytecode (. class file) - an intermediate format which is understandable by the Java Virtual Machine (JVM). And java is the program that starts the JVM, which in turn, loads the . class file, verifies the bytecode and executes it.
I have found the answer myself.
When javac is compiling code it doesn't link against rt.jar by default. Instead it uses special symbol file lib/ct.sym with class stubs.
Surprisingly this file contains many but not all of internal sun classes. In my case one of those more-internal-than-usual classes was sun.awt.event.IgnorePaintEvent.
And the answer to my question is: javac -XDignore.symbol.file
That's what javac uses for compiling rt.jar.
102
In addition to the answer by @marcin-wisnicki if you're using Maven, note that the compiler plugin will silently drop any -XD flags, unless you also specify <fork>true</fork>: e.g.
<build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.3</version> <configuration> <source>1.7</source> <target>1.7</target> <compilerArgs> <arg>-XDignore.symbol.file</arg> </compilerArgs> <fork>true</fork> </configuration> ... If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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