Eclipse cannot find swt-gtk

Status changed to 'Confirmed' because the bug affects multiple users.

Here is a small workaround:
ln -s /usr/lib/jni/libswt-gnome-gtk-3740.so ~/.swt/lib/linux/x86_64/libswt-gtk.so

Oh, this bug happens with Oracle Java 7... So switching to OpenJDK helps too.

also affects Black Opal

echo "-Djava.library.path=/usr/lib/jni" >> /etc/eclipse.ini
 fixed it for me.

After doing
ln -s /usr/lib/jni/libswt-gnome-gtk-3740.so ~/.swt/lib/linux/x86_64/libswt-gtk.so

It still halts on startup. Here is the log file

!SESSION 2012-12-27 11:14:12.565 -----------------------------------------------
eclipse.buildId=I20110613-1736
java.version=1.7.0_10
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US
Command-line arguments: -os linux -ws gtk -arch x86_64

!ENTRY org.eclipse.osgi 4 0 2012-12-27 11:14:14.262
!MESSAGE Application error
!STACK 1
java.lang.UnsatisfiedLinkError: org.eclipse.swt.internal.C.PTR_sizeof()I
        at org.eclipse.swt.internal.C.PTR_sizeof(Native Method)
        at org.eclipse.swt.internal.C.<clinit>(C.java:24)
        at org.eclipse.swt.internal.Converter.wcsToMbcs(Converter.java:63)
        at org.eclipse.swt.internal.Converter.wcsToMbcs(Converter.java:54)
        at org.eclipse.swt.widgets.Display.<clinit>(Display.java:132)
        at org.eclipse.ui.internal.Workbench.createDisplay(Workbench.java:695)
        at org.eclipse.ui.PlatformUI.createDisplay(PlatformUI.java:161)
        at org.eclipse.ui.internal.ide.application.IDEApplication.createDisplay(IDEApplication.java:153)
        at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:95)
        at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:601)
        at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)
 at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
        at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
        at org.eclipse.equinox.launcher.Main.main(Main.java:1386)

Same for me when just installing rather than upgrading. However I have both OpenJDK and Oracle's Java installed (got to have Minecraft after all).

!SESSION 2013-02-01 13:16:47.514 -----------------------------------------------
eclipse.buildId=I20110613-1736
java.version=1.7.0_02
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_US
Command-line arguments: -os linux -ws gtk -arch x86_64

!ENTRY org.eclipse.osgi 4 0 2013-02-01 13:16:48.511
!MESSAGE Application error
!STACK 1
java.lang.UnsatisfiedLinkError: Could not load SWT library. Reasons:
 no swt-gtk-3740 in java.library.path
 no swt-gtk in java.library.path
 Can't load library: /home/beanow/.swt/lib/linux/x86_64/libswt-gtk-3740.so
 Can't load library: /home/beanow/.swt/lib/linux/x86_64/libswt-gtk.so

 at org.eclipse.swt.internal.Library.loadLibrary(Library.java:285)
 at org.eclipse.swt.internal.Library.loadLibrary(Library.java:194)
 at org.eclipse.swt.internal.C.<clinit>(C.java:21)
 at org.eclipse.swt.internal.Converter.wcsToMbcs(Converter.java:63)
 at org.eclipse.swt.internal.Converter.wcsToMbcs(Converter.java:54)
 at org.eclipse.swt.widgets.Display.<clinit>(Display.java:132)
 at org.eclipse.ui.internal.Workbench.createDisplay(Workbench.java:695)
 at org.eclipse.ui.PlatformUI.createDisplay(PlatformUI.java:161)
 at org.eclipse.ui.internal.ide.application.IDEApplication.createDisplay(IDEApplication.java:153)
 at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:95)
 at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
 at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
 at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
 at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344)
 at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
 at java.lang.reflect.Method.invoke(Unknown Source)
 at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)
 at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
 at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
 at org.eclipse.equinox.launcher.Main.main(Main.java:1386)

#5's solution also worked for me.

#5 workaround +1 too, thanks
Ubuntu 12.04LTS
Java uses default alternative.