如何按照Hibernate教程中的描述启动HSQLDB服务器？

Question

尝试按照此Hibernate教程中的步骤#4进行操作:

mvn exec:java -Dexec.mainClass="org.hsqldb.Server" -Dexec.args="-database.0 file:target/data/tutorial"

我收到此错误:

[INFO] Scanning for projects...
[INFO] Searching repository for plugin with prefix: 'exec'.
[INFO] ------------------------------------------------------------------------
[INFO] Building First Hibernate Tutorial
[INFO]    task-segment: [exec:java]
[INFO] ------------------------------------------------------------------------
[INFO] Preparing exec:java
[INFO] No goals needed for project - skipping
[INFO] [exec:java {execution: default-cli}]
[WARNING]
java.lang.ClassNotFoundException: org.hsqldb.Server
        at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
        at org.codehaus.mojo.exec.ExecJavaMojo$1.run(ExecJavaMojo.java:285)
        at java.lang.Thread.run(Thread.java:662)
[INFO] ------------------------------------------------------------------------
[ERROR] BUILD ERROR
[INFO] ------------------------------------------------------------------------
[INFO] An exception occured while executing the Java class. org.hsqldb.Server

[INFO] ------------------------------------------------------------------------
[INFO] For more information, run Maven with the -e switch
[INFO] ------------------------------------------------------------------------
[INFO] Total time: < 1 second
[INFO] Finished at: Mon Dec 17 16:35:42 EST 2012
[INFO] Final Memory: 6M/15M
[INFO] ------------------------------------------------------------------------

尽管下载了最新的hsqldb软件包并按照FAQ进行安装.该hsqldb.jar文件位于,C:\hsqldb-2.2.9\hsqldb-2.2.9\hsqldb\lib并且类路径env var指向它:

CLASSPATH=C:\hsqldb-2.2.9\hsqldb-2.2.9\hsqldb\lib

那么为什么我收到这个ClassNotFoundException:org.hsqldb.Server错误？

我究竟做错了什么？

Answer 1

首先,您的CLASSPATH通常不适用于任何jar.必须指定jar名称,例如:

CLASSPATH=C:\hsqldb-2.2.9\hsqldb-2.2.9\hsqldb\lib\hsqldb.jar

其次,本教程不需要CLASSPATH,因为它是一个Maven项目.您应该将相关的依赖项添加到您提到的教程的1.1.1节中描述的pom.xml文件中.只需将此块添加到选项卡内的pom.xml中列出的块:

<dependency>
    <groupId>org.hsqldb</groupId>
    <artifactId>hsqldb</artifactId>
    <version>2.2.9</version>
</dependency>