为 JavaScriptEngine 获取 java ClassNotFoundException答案

【问题标题】：Getting java ClassNotFoundException for JavaScriptEngine为 JavaScriptEngine 获取 java ClassNotFoundException
【发布时间】：2016-12-03 17:38:11
【问题描述】：

我在执行ant build-db-userprofile (tutorial I'm following) 时收到java.lang.ClassNotFoundException: org.apache.bsf.engines.javascript.JavaScriptEngine。

显然这是由于 $ANT_HOME/lib 中不存在 BSF .jar 而导致的，但当我执行 ls -l $ANT_HOME/lib && ant -version 时，我得到以下信息：

-bash-4.1$ ls -l $ANT_HOME/lib
total 0
lrwxrwxrwx. 1 root root 28 May 30 10:03 ant-antlr.jar -> ../../java/ant/ant-antlr.jar
lrwxrwxrwx. 1 root root 34 May 30 10:03 ant-apache-bcel.jar -> ../../java/ant/ant-apache-bcel.jar
lrwxrwxrwx. 1 root root 33 May 30 10:03 ant-apache-bsf.jar -> ../../java/ant/ant-apache-bsf.jar
lrwxrwxrwx. 1 root root 35 May 30 10:03 ant-apache-log4j.jar -> ../../java/ant/ant-apache-log4j.jar
lrwxrwxrwx. 1 root root 33 May 30 10:03 ant-apache-oro.jar -> ../../java/ant/ant-apache-oro.jar
lrwxrwxrwx. 1 root root 36 May 30 10:03 ant-apache-regexp.jar -> ../../java/ant/ant-apache-regexp.jar
lrwxrwxrwx. 1 root root 38 May 30 10:03 ant-apache-resolver.jar -> ../../java/ant/ant-apache-resolver.jar
lrwxrwxrwx. 1 root root 28 May 30 10:02 ant-bootstrap.jar -> ../../java/ant-bootstrap.jar
lrwxrwxrwx. 1 root root 38 May 30 10:03 ant-commons-logging.jar -> ../../java/ant/ant-commons-logging.jar
lrwxrwxrwx. 1 root root 34 May 30 10:03 ant-commons-net.jar -> ../../java/ant/ant-commons-net.jar
lrwxrwxrwx. 1 root root 18 May 30 10:02 ant.jar -> ../../java/ant.jar
lrwxrwxrwx. 1 root root 31 May 30 10:03 ant-javamail.jar -> ../../java/ant/ant-javamail.jar
lrwxrwxrwx. 1 root root 30 May 30 10:03 ant-jdepend.jar -> ../../java/ant/ant-jdepend.jar
lrwxrwxrwx. 1 root root 27 May 30 10:03 ant-jsch.jar -> ../../java/ant/ant-jsch.jar
lrwxrwxrwx. 1 root root 28 May 30 10:03 ant-junit.jar -> ../../java/ant/ant-junit.jar
lrwxrwxrwx. 1 root root 27 May 30 10:02 ant-launcher.jar -> ../../java/ant-launcher.jar
lrwxrwxrwx. 1 root root 29 May 30 10:02 ant-nodeps.jar -> ../../java/ant/ant-nodeps.jar
lrwxrwxrwx. 1 root root 28 May 30 10:03 ant-swing.jar -> ../../java/ant/ant-swing.jar
lrwxrwxrwx. 1 root root 27 May 30 10:03 ant-trax.jar -> ../../java/ant/ant-trax.jar
-bash-4.1$
-bash-4.1$ ant -version

Apache Ant version 1.7.1 compiled on May 10 2016

已经提到的另一种可能性是使用 JDK

ANT_HOME=/usr/share/ant ANT_OPTS=-server -XX:MaxPermSize=256M -Xmx1000m -XX:+UseParallelGC -Xms1000m -XX:SoftRefLRUPolicyMSPerMB=1 -XX:MaxHeapFreeRatio=99

【问题讨论】：

该软链接是活动的还是损坏的？
@BhargavKumarR 抱歉，我不理解/不理解这个问题。
ant-apache-bsf.jar -> ../../java/ant/ant-apache-bsf.jar 该路径有效吗？
@BhargavKumarR 哦，我明白了，是的，它是一个有效路径，该目录也有 jar。

标签： javascript java linux ant intermine

【解决方案1】：

我通过在我的主目录中编译和安装 ant 来解决这个问题。问题的发生可能是因为我正在处理的服务器的设置方式，以及我没有管理员权限这一事实。

【讨论】：