安装scala插件后，eclipse需要很大的内存，需要修改eclipse.ini
-startupplugins/org.eclipse.equinox.launcher_1.2.0.v20110502.jar-productorg.eclipse.epp.package.jee.product-showsplashorg.eclipse.platform-vmargs-Xms128M -Xmx512M -XX:PermSize=64M -XX:MaxPermSize=128M -XX:+UseParallelGC-XX:+UnlockDiagnosticVMOptions-XX:+UnsyncloadClass-Dosgi.classloader.lock=classname?