今天解压Eclipse的安装包，首先是解压出错，没有在意。点击继续解压。全部解压后，点击eclipse.exe运行，发现弹出错误。提示不能启动。
查看eclipse-java-galileo-win32\eclipse\configuration\1287498612866.log，看到异常信息部分如下：
!SESSION 2010-10-19 22:30:11.424 -----------------------------------------------
eclipse.buildId=I20090611-1540
java.version=1.6.0_21
java.vendor=Sun Microsystems Inc.
BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=zh_CN
Framework arguments: -product org.eclipse.epp.package.java.product
Command-line arguments: -os win32 -ws win32 -arch x86 -product org.eclipse.epp.package.java.product
!ENTRY org.eclipse.equinox.simpleconfigurator 4 0 2010-10-19 22:30:14.698
!MESSAGE
!STACK 0
org.osgi.framework.BundleException: Exception in org.eclipse.equinox.internal.simpleconfigurator.Activator.start() of bundle org.eclipse.equinox.simpleconfigurator.
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:805)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:754)
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:352)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundle.java:370)
at org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.java:1068)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:557)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLevelManager.java:464)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:248)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:445)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:220)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:330)
Caused by: java.lang.NullPointerException
at java.net.URL.<init>(Unknown Source)
at java.net.URL.<init>(Unknown Source)
at java.net.URL.<init>(Unknown Source)
at org.eclipse.equinox.internal.simpleconfigurator.utils.SimpleConfiguratorUtils.getBundleLocation(SimpleConfiguratorUtils.java:178)
at org.eclipse.equinox.internal.simpleconfigurator.ConfigApplier.installBundles(ConfigApplier.java:192)
at org.eclipse.equinox.internal.simpleconfigurator.ConfigApplier.install(ConfigApplier.java:89)
at org.eclipse.equinox.internal.simpleconfigurator.SimpleConfiguratorImpl.applyConfiguration(SimpleConfiguratorImpl.java:129)
at org.eclipse.equinox.internal.simpleconfigurator.SimpleConfiguratorImpl.applyConfiguration(SimpleConfiguratorImpl.java:143)
at org.eclipse.equinox.internal.simpleconfigurator.Activator.start(Activator.java:48)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:782)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:773)
... 10 more
Root exception:
java.lang.NullPointerException
at java.net.URL.<init>(Unknown Source)
at java.net.URL.<init>(Unknown Source)
at java.net.URL.<init>(Unknown Source)
at org.eclipse.equinox.internal.simpleconfigurator.utils.SimpleConfiguratorUtils.getBundleLocation(SimpleConfiguratorUtils.java:178)
at org.eclipse.equinox.internal.simpleconfigurator.ConfigApplier.installBundles(ConfigApplier.java:192)
at org.eclipse.equinox.internal.simpleconfigurator.ConfigApplier.install(ConfigApplier.java:89)
at org.eclipse.equinox.internal.simpleconfigurator.SimpleConfiguratorImpl.applyConfiguration(SimpleConfiguratorImpl.java:129)
at org.eclipse.equinox.internal.simpleconfigurator.SimpleConfiguratorImpl.applyConfiguration(SimpleConfiguratorImpl.java:143)
at org.eclipse.equinox.internal.simpleconfigurator.Activator.start(Activator.java:48)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:782)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:773)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:754)
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:352)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundle.java:370)
at org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.java:1068)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:557)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLevelManager.java:464)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:248)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:445)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:220)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:330)
!ENTRY org.eclipse.osgi 4 0 2010-10-19 22:30:14.711
!MESSAGE Bundle org.eclipse.equinox.simpleconfigurator_1.0.100.v20090520-1905 [1] is not active.
!ENTRY org.eclipse.osgi 4 0 2010-10-19 22:30:14.725
!MESSAGE Application error
!STACK 1
java.lang.IllegalStateException: Unable to acquire application service. Ensure that the org.eclipse.core.runtime bundle is resolved and started (see config.ini).
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:74)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:368)
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:559)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:514)
at org.eclipse.equinox.launcher.Main.run(Main.java:1311)
查看过环境变量，发现正常。不是这个问题，最后在一个外国的论坛上发现有个人有如下的解答：
Incorrectly unzipped.
Believe it or not, about once a month, a user reports start-up failure: The user has unzipped Eclipse without selecting the use folder names option. Make sure that the result of unzipping is an install tree with an eclipse directory at its root. The Ark unzip utility in KDE is known to mangle Eclipse zips, so use a different unzip program to install there. The built-in unzip utility in Windows has also been known to have problems, particularly when installing into paths with relatively long names.
感觉应该是解压路径的问题，可能是解压的路径出现了中文或是路径长度过长的问题。于是把压缩包放在C盘本目录下解压。解药后发现运行正常。还真是这个问题，无语。感觉上是路径过长的问题可能性比较大。
所以，以后安装软件或是解压软件时，不要把放在太多层的目录下。
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