Hi All, I was recently trying to run a java project, developed for and run with Sun's java, with the gcc compiler instead. When I first installed the gcj available from the Ubuntu repository, I ran into compilation erros and then realised that the version shipped on the repos was relatively old (4.2.4) so I decided to upgrade it to the latest one, hoping that these compilation issues will get resolved. With great help from this forum, I got the newest GCC running on my machine with the following commands: $ svn co http://gcc.gnu.org/svn/gcc/branches/gcc-4_4-branch/ $ mkdir gcc-4_4-branch/obj-x86_64-unknown-linux-gnu $ cd gcc-4_4-branch/obj-x86_64-unknown-linux-gnu $ `pwd`/../configure --enable-languages=java --prefix=/local/gcc-4_4-branch/install --enable-java-home --enable-java-awt=gtk $ make && make install $ /local/gcc-4_4-branch/install/lib/jvm/bin/java -version java version "1.5.0" gij (GNU libgcj) version 4.4.0 20090330 (prerelease) Using Eclipse, I linked my project to the newly installed JRE (JRE home directory on '/local/gcc-4_4-branch/install/lib/jvm' ; JRE system libraries on '/local/gcc-4_4-branch/install/share/java/libgcj-4.4.0.jar' and the sourcefile on '~/gcc-4_4-branch/libjava/classpath' ) When I try ro tun the project (from Eclipse), I ran into exactly the same compilation errors as encountered with the older gcc version: Exception in thread "main" java.lang.IllegalArgumentException at javax.swing.ScrollPaneLayout.addLayoutComponent(ScrollPaneLayout.java:148) at java.awt.Container.addImpl(Container.java:392) at java.awt.Container.add(Container.java:230) at nl.kbna.dioscuri.GUI.setScreen(GUI.java:512) at nl.kbna.dioscuri.GUI.<init>(GUI.java:256) at nl.kbna.dioscuri.GUI.<init>(GUI.java:295) at nl.kbna.dioscuri.GUI.main(GUI.java:213) The problem seem to lie with AWT and Swing... and by digging deeper into the code I found that: In GUI.java the following call is made: screenPane.add(screen); This works using Sun's Java, but causes a IllegalArgumentException in GCJ and the reason seems to be as follows: GCJ java.awt.Container class on line 276 contains code for the above call: add(Component comp) { addImpl(comp, null, -1) } The addImpl function calls, near the end (line 390): layoutMgr.addLayoutComponent("", comp); because it was passed null constraints. The ScrollPaneLayout class implements the addLayoutComp (line 125): addLayoutComponent(String key, Component component) but notice that the 'key' variable has been passed an empty String; this function now throws an IllegalArgumentException. .... As anyone had this sort of problem ? Any idea how to fix it ? Could it be a problem of mixing AWT and Swing together ? Regards David Michel
