hsqldb-2.2.5运行runManager.bat报错

解决hsqldb运行错误：UnsupportedClassVersionError

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在尝试运行hsqldb的runManager.bat时遇到错误：'Exception in thread "main" java.lang.UnsupportedClassVersionError: oil/DatabaseManager (Unsupported major.minor version 50.0)'。问题源于系统中使用的JDK版本过低，为1.3.1_01。通过检查环境变量PATH和JAVA_HOME，发现存在多个JDK版本，包括1.1.8和1.3.1。为解决此问题，更新JAVA_HOME指向JDK1.6.0_20，并将%JAVA_HOME%in添加到PATH变量前，之后成功运行runManager.bat。

D:\Java_Essential\hsqldb-2.2.5\hsqldb\bin>cd ..\data
Exception in thread "main" java.lang.UnsupportedClassVersionError: o
il/DatabaseManager (Unsupported major.minor version 50.0) //最低版本5.0 JDK问题
        at java.lang.ClassLoader.defineClass0(Native Method)
        at java.lang.ClassLoader.defineClass(Unknown Source)
        at java.security.SecureClassLoader.defineClass(Unknown Sourc
        at java.net.URLClassLoader.defineClass(Unknown Source)
        at java.net.URLClassLoader.access$100(Unknown Source)
        at java.net.URLClassLoader$1.run(Unknown Source)
        at java.security.AccessController.doPrivileged(Native Method
        at java.net.URLClassLoader.findClass(Unknown Source)
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at sun.misc.Launcher$AppClassLoader.loadClass(Unknown Source
        at java.lang.ClassLoader.loadClass(Unknown Source)
        at java.lang.ClassLoader.loadClassInternal(Unknown Source)

在cmd中输入java -version

C:\Documents and Settings\Administrator>java -version
java version "1.3.1_01"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1_01)
Java HotSpot(TM) Client VM (build 1.3.1_01, mixed mode)
版本是1.3.1_01 ...流汗什么时候用这么低版本的JDK

点击环境变量path变量查看值:

D:\oracle\ora92\bin;E:\oracle10g\bin;C:\Program Files\Oracle\jre\1.3.1\bin;C:\Program Files\Oracle\jre\1.1.8\bin;%SystemRoot%\system32;%SystemRoot%;%SystemRoot%\System32\Wbem;D:\Program Files\TortoiseSVN\bin;C:\Program Files\Common Files\Lenovo;C:\Program Files\ThinkPad Wireless LAN Adapter Software;C:\Program Files\Intel\WiFi\bin\

安装oracle10g的时候带了个JDK1.3，现在就是要设置path环境变量了,嗯...后面还有一个C:\Program Files\Oracle\jre\1.1.8\bin,

java.version, oracle.jserver.version, and oracle.server.version

In release 9.2.0, we return "1.3.1" for java.version property, to
correspond to the JDK default. If you have been using the presence of
"Oracle" in java.version to determine whether your code is running on
Oracle9i JVM as opposed to the client, then you should switch to testing
whether the oracle.jserver.version property is non-null. (In release
8.1.5, the value of java.version was "Oracle Server 1.1.6". In release
8.1.6, 8.1.7 and 9.0.1 the value of java.version was "1.2.1"). The
property oracle.server.version is now deprecated. It was set in 8.1.5,
8.1.6 and 8.1.7 for backward compatibility reasons only.

Oracle9i帮助说明,向后兼容带的1.1.8。

ava(TM) 2 SDK, Standard Edition Version 1.4.2

For a more extensive HTML version of this file, see README.html.

Contents

   * Introduction
   * System Requirements & Installation
   * Release Notes
   * Bug Reports and Feedback
   * Java 2 SDK Documentation
   * Redistribution
   * Web Pages

Oracle10g,1.4.2.

看下JAVA_HOME变量指向路径C:\Program Files\Java

奇怪怎么没看到JDK这级目录，改下变成C:\Program Files\Java\jdk1.6.0_20，给你个高版本让你开心下

在path变量前加上%JAVA_HOME%\bin;重新运行runManager.bat,OK