2009/4/14 David Michel <dmichel76@xxxxxxxxxxxxxx>: > 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 > > It's not necessary to mix the two to trigger this bug. You merely need to add a component to a component using the ScrollPaneLayout: public TestSwing() { setLayout(new ScrollPaneLayout()); add(new JButton()); } This runs on IcedTea but fails on Classpath: 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:297) at javax.swing.JFrame.addImpl(JFrame.java:264) at java.awt.Container.add(Container.java:230) at TestSwing.<init>(TestSwing.java:12) at TestSwing.main(TestSwing.java:17) The error is not in ScrollPaneLayout. Changing the code to: ScrollPaneLayout l = new ScrollPaneLayout(); l.addLayoutComponent("", new JButton()); correctly triggers an IllegalArgumentException on both IcedTea and Classpath: $ cacao TestSwing Exception in thread "main" java.lang.IllegalArgumentException at javax.swing.ScrollPaneLayout.addLayoutComponent(ScrollPaneLayout.java:148) at TestSwing.<init>(TestSwing.java:12) at TestSwing.main(TestSwing.java:19) $ /usr/lib/icedtea6/bin/java TestSwing Exception in thread "main" java.lang.IllegalArgumentException: invalid layout key at javax.swing.ScrollPaneLayout.addLayoutComponent(ScrollPaneLayout.java:257) at TestSwing.<init>(TestSwing.java:12) at TestSwing.main(TestSwing.java:19) Existing bug: http://gcc.gnu.org/bugzilla/show_bug.cgi?id=39553 -- Andrew :-) Free Java Software Engineer Red Hat, Inc. (http://www.redhat.com) Support Free Java! Contribute to GNU Classpath and the OpenJDK http://www.gnu.org/software/classpath http://openjdk.java.net PGP Key: 94EFD9D8 (http://subkeys.pgp.net) Fingerprint: F8EF F1EA 401E 2E60 15FA 7927 142C 2591 94EF D9D8
