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从JDK 6升级到JDK 7过程中遇到的一个问题（卸载rpm）
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先前系統上有JDK 6的安裝，由于要部署Facebook的Presto做一些測試，需要將其升級到JDK 7，但是在安裝的過程中遇到以下的問題：
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[root@x01?data2]#?rpm?-ivh?--force?--replacepkgs?jdk-7u45-linux-x64.rpm???????????? Preparing...????????????????###########################################?[100%]?? ???1:jdk????????????????????###########################################?[100%]?? Unpacking?JAR?files...?? ????????rt.jar...?? Error:?Could?not?open?input?file:?/usr/java/jdk1.7.0_45/jre/lib/rt.pack?? Error:?unpack?could?not?create?JAR?file:?? ?? ????????/usr/java/jdk1.7.0_45/jre/lib/rt.jar?? ?? Please?refer?to?the?Troubleshooting?section?of?the?Installation?Instructions?? on?the?download?page.?? ????????jsse.jar...?? Error:?Could?not?open?input?file:?/usr/java/jdk1.7.0_45/jre/lib/jsse.pack?? Error:?unpack?could?not?create?JAR?file:?? ?? ????????/usr/java/jdk1.7.0_45/jre/lib/jsse.jar?? ?? Please?refer?to?the?Troubleshooting?section?of?the?Installation?Instructions?? on?the?download?page.?? ????????charsets.jar...?? Error:?Could?not?open?input?file:?/usr/java/jdk1.7.0_45/jre/lib/charsets.pack?? Error:?unpack?could?not?create?JAR?file:?? ?? ????????/usr/java/jdk1.7.0_45/jre/lib/charsets.jar?? ?? Please?refer?to?the?Troubleshooting?section?of?the?Installation?Instructions?? on?the?download?page.?? ????????tools.jar...?? Error:?Could?not?open?input?file:?/usr/java/jdk1.7.0_45/lib/tools.pack?? Error:?unpack?could?not?create?JAR?file:?? ?? ????????/usr/java/jdk1.7.0_45/lib/tools.jar?? ?? Please?refer?to?the?Troubleshooting?section?of?the?Installation?Instructions?? on?the?download?page.?? ????????localedata.jar...?? Error:?Could?not?open?input?file:?/usr/java/jdk1.7.0_45/jre/lib/ext/localedata.pack?? Error:?unpack?could?not?create?JAR?file:?? ?? ????????/usr/java/jdk1.7.0_45/jre/lib/ext/localedata.jar?? ?? Please?refer?to?the?Troubleshooting?section?of?the?Installation?Instructions?? on?the?download?page.?? ????????jfxrt.jar...?? Error:?Could?not?open?input?file:?/usr/java/jdk1.7.0_45/jre/lib/jfxrt.pack?? Error:?unpack?could?not?create?JAR?file:?? ?? ????????/usr/java/jdk1.7.0_45/jre/lib/jfxrt.jar?? ?? Please?refer?to?the?Troubleshooting?section?of?the?Installation?Instructions?? on?the?download?page.??
如果在這種情況下，我們查看Java的版本，會報出以下的錯誤：
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[root@x01?data2]#?java?-version?? Error?occurred?during?initialization?of?VM?? java/lang/NoClassDefFoundError:?java/lang/Object??
最終的解決辦法，是清理掉系統殘留的舊版本的相關的安裝：
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[root@x01?data2]#?rpm?-qa?|?grep?jdk?? jdk-1.7.0_45-fcs.x86_64?? [root@x01?data2]#?rpm?-e?jdk-1.7.0_45-fcs.x86_64?? [root@x01?data2]#?rpm?-qa?|?grep?jdk?? [root@x01?data2]#?rpm?-qa?|?grep?java?? sun-javadb-core-10.6.2-1.1.i386?? sun-javadb-javadoc-10.6.2-1.1.i386?? sun-javadb-common-10.6.2-1.1.i386?? sun-javadb-client-10.6.2-1.1.i386?? sun-javadb-docs-10.6.2-1.1.i386?? sun-javadb-demo-10.6.2-1.1.i386?? [root@x01?data2]#?rpm?-e?sun-javadb-*?? error:?package?sun-javadb-*?is?not?installed?? [root@x01?data2]#?rpm?-e?sun-javadb-core-10.6.2-1.1.i386??sun-javadb-javadoc-10.6.2-1.1.i386?sun-javadb-common-10.6.2-1.1.i386?sun-javadb-client-10.6.2-1.1.i386?sun-javadb-docs-10.6.2-1.1.i386?sun-javadb-demo-10.6.2-1.1.i386?? [root@x01?data2]#?rpm?-qa?|?grep?java?? [root@x01?data2]#?rpm?-qa?|?grep?jre?? [root@x01?data2]#?rpm?-qa?|?grep?java?? [root@x01?data2]#?rpm?-qa?|?grep?jdk??
這樣之后，再運行先前的安裝程序即可：
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[root@x01?data2]#?rpm?-ivh??jdk-7u45-linux-x64.rpm???????????????????????? Preparing...????????????????###########################################?[100%]?? ???1:jdk????????????????????###########################################?[100%]?? Unpacking?JAR?files...?? ????????rt.jar...?? ????????jsse.jar...?? ????????charsets.jar...?? ????????tools.jar...?? ????????localedata.jar...?? ????????jfxrt.jar...?? [root@x01?data2]#?source?/etc/profile?? [root@x01?data2]#?java?-version?? java?version?"1.7.0_45"?? Java(TM)?SE?Runtime?Environment?(build?1.7.0_45-b18)?? Java?HotSpot(TM)?64-Bit?Server?VM?(build?24.45-b08,?mixed?mode)?? [root@x01?data2]# ??
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