{"id":2950,"date":"2012-05-11T09:13:00","date_gmt":"2012-05-11T08:13:00","guid":{"rendered":"http:\/\/touk.pl\/blog\/?guid=38cdd4f65395f76233abd097b9df32c1"},"modified":"2022-07-26T12:58:08","modified_gmt":"2022-07-26T10:58:08","slug":"gwt-hosted-mode-on-64bit-linux","status":"publish","type":"post","link":"https:\/\/touk.pl\/blog\/2012\/05\/11\/gwt-hosted-mode-on-64bit-linux\/","title":{"rendered":"GWT Hosted mode on 64bit linux"},"content":{"rendered":"

GWT for linux is build against 32bit architecture. It contains some SWT\/GTK 32bit modules. So if you try to run it with 64bit java it fails<\/p>\n

Exception in thread “main” java.lang.UnsatisfiedLinkError: \/opt\/tools\/sdk\/gwt\/gwt-linux-1.5.3\/libswt-pi-gtk-3235.so: \/opt\/tools\/sdk\/gwt\/gwt-linux-1.5.3\/libswt-pi-gtk-3235.so: wrong ELF class: ELFCLASS32 (Possible cause: architecture word width mismatch)
\n\u00a0\u00a0\u00a0 at java.lang.ClassLoader$NativeLibrary.load(Native Method)
\n\u00a0\u00a0\u00a0 at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1807)
\n\u00a0\u00a0\u00a0 at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1703)
\n\u00a0\u00a0\u00a0 at java.lang.Runtime.load0(Runtime.java:770)
\n\u00a0\u00a0\u00a0 at java.lang.System.load(System.java:1003)
\n\u00a0\u00a0\u00a0 at org.eclipse.swt.internal.Library.loadLibrary(Library.java:132)
\n\u00a0\u00a0\u00a0 at org.eclipse.swt.internal.gtk.OS.(OS.java:22)
\n\u00a0\u00a0\u00a0 at org.eclipse.swt.internal.Converter.wcsToMbcs(Converter.java:63)
\n\u00a0\u00a0\u00a0 at org.eclipse.swt.internal.Converter.wcsToMbcs(Converter.java:54)
\n\u00a0\u00a0\u00a0 at org.eclipse.swt.widgets.Display.(Display.java:126)
\n\u00a0\u00a0\u00a0 at com.google.gwt.dev.GWTShell.(GWTShell.java:301)
\nCould not find the main class: com.google.gwt.dev.GWTShell.\u00a0 Program will exit.
\n[INFO] ————————————————————————
\n[ERROR] BUILD ERROR<\/em><\/p>\n

You have two choices. Find 64bit SWT\/GTK modules with same build version (3235 in this case) – good luck! or download 32bit JRE.<\/p>\n

I chose second option and it took me 3 mins to resolve the problem.
\nFind proper JRE version on Oracle site<\/a> I suggest bin<\/em> file instead rpm. It unpacks jre to own dir. Move that directory to some convenient location (it doesn’t matter where). Edit gwt.properties *and set<\/em> java.executable* to java<\/em> exec located in 32bit JRE.
\nNow run your GWT hosted mode and be unstoppable developer!<\/p>\n

\n <\/a>\n<\/div>\n

You may have some warnings from GTK, such as<\/p>\n

\/usr\/lib\/gtk-2.0\/2.10.0\/menuproxies\/libappmenu.so: wrong ELF class: ELFCLASS64<\/em>
\n(GWT:351): Gtk-WARNING **: Failed to load type module: \/usr\/lib\/gtk-2.0\/2.10.0<\/em>
\n\/menuproxies\/libappmenu.so<\/em>
\n**<\/p>\n

But it has no consequences for me, so far…<\/p>\n

Some sources say that you should set an environment var:<\/p>\n

export LIBXCB_ALLOW_SLOPPY_LOCK=1<\/em><\/p>\n

to block bugs in X display layer but I don’t know what does it mean :)<\/p>\n

In this case I had to hadle with GWT version 1.5.3 (old corporate project)<\/i><\/span><\/p>\n

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