java.lang.NoClassDefFoundError：从 AIX 运行时出现 javax.mail.Address 错误

发布于 2024-11-28 11:16:02 字数 752 浏览 4 评论 0原文

我正在尝试在我的 AIX 服务器上运行 java 程序。我编写了

/usr/java6/bin/javac  -classpath :.:/usr/jdk/commons-net-3.0.1.jar:/usr/jdk/classes12.jar:/usr/jdk/mysql-connector-java-5.1.17-bin.jar:/usr/jdk/jtds-1.2.5.jar:/urs/jdk/mail.jar:/usr/jdk/joda-time-1.6.2.jar:/usr/jdk/commons-codec-1.4.jar:/usr/jdk/commons-logging-1.1.1.jar:/usr/jdk/httpclient-4.1.1.jar:/usr/jdk/httpclient-cache-4.1.1.jar:/usr/jdk/httpcore-4.1.jar:/usr/jdk/httpmime-4.1.1.jar:/usr/jdk/mailapi.jar:/usr/jdk/pop3.jar:/usr/jdk/smtp.jar:/usr/jdk/dsn.jar:/usr/jdk/imap.jar -d . *.java

似乎可以正确编译的类路径。然后，当我运行该程序时

java daily_transmission

，出现错误 java.lang.NoClassDefFoundError: javax.mail.Address。 Eclipse 之前运行时的所有 .jar 文件都位于 /usr/jdk 文件中。

原文

I am trying to run a java program on my AIX server. I wrote the classpath

/usr/java6/bin/javac  -classpath :.:/usr/jdk/commons-net-3.0.1.jar:/usr/jdk/classes12.jar:/usr/jdk/mysql-connector-java-5.1.17-bin.jar:/usr/jdk/jtds-1.2.5.jar:/urs/jdk/mail.jar:/usr/jdk/joda-time-1.6.2.jar:/usr/jdk/commons-codec-1.4.jar:/usr/jdk/commons-logging-1.1.1.jar:/usr/jdk/httpclient-4.1.1.jar:/usr/jdk/httpclient-cache-4.1.1.jar:/usr/jdk/httpcore-4.1.jar:/usr/jdk/httpmime-4.1.1.jar:/usr/jdk/mailapi.jar:/usr/jdk/pop3.jar:/usr/jdk/smtp.jar:/usr/jdk/dsn.jar:/usr/jdk/imap.jar -d . *.java

which seems to compile correctly. Then when I run the program

java daily_transmission

i get the error java.lang.NoClassDefFoundError: javax.mail.Address. All the .jar files that were in Eclipse when it worked before are in the /usr/jdk file.

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嘦怹 2024-12-05 11:16:02

NoClassDefFoundError意味着（引用相关的 JavaDoc）：

如果 Java 虚拟机或类加载器实例尝试
加载类的定义（作为正常方法调用的一部分或
作为使用 new 表达式创建新实例的一部分）并且没有
可以找到类的定义。
当前执行时搜索到的类定义已存在
类已编译，但无法再找到定义。

需要检查两件事：

首先，您的类路径中似乎有一个拼写错误（尽管在编译代码时它不可能存在，否则它不会编译成功，所以这显然不是根路径）您所看到的异常的原因。）：
```
<代码>/urs/jdk/mail.jar
```
应该是
<预><代码>/usr/jdk/mail.jar

确保您还使用 -classpath 选项将类路径传递给 java 以及 javac 拿起那些运行时的 .jar 文件：

java -classpath :.:/usr/jdk/commons-net-3.0.1.jar:/usr/jdk/classes12.jar:/usr/jdk/mysql-connector-java-5.1.17-bin.jar:/usr/jdk /j tds-1.2.5.jar:/urs/jdk/mail.jar:/usr/jdk/joda-time-1.6.2.jar:/usr/jdk/commons-codec-1.4.jar:/usr/jdk/公共日志ing-1.1.1.jar:/usr/jdk/httpclient-4.1.1.jar:/usr/jdk/httpclient-cache-4.1.1.jar:/usr/jdk/httpcore-4.1.jar:/usr/ j dk/httpmime-4.1.1.jar:/usr/jdk/mailapi.jar:/usr/jdk/pop3.jar:/usr/jdk/smtp.jar:/usr/jdk/dsn.jar:/usr/jdk /imap.jar每日传输

A NoClassDefFoundError means that (quoting the relevant JavaDoc):

Thrown if the Java Virtual Machine or a ClassLoader instance tries to
load in the definition of a class (as part of a normal method call or
as part of creating a new instance using the new expression) and no
definition of the class could be found.
The searched-for class definition existed when the currently executing
class was compiled, but the definition can no longer be found.

Two things to check:

Firstly, you appear to have have a typo in your classpath (though it can't have been there when you compiled the code, or it wouldn't have compiled successfully, so that's clearly not the root cause of the exception you're seeing.):
```
/urs/jdk/mail.jar
```
should be
```
/usr/jdk/mail.jar
```

Make sure that you are also using the -classpath option to pass the classpath to java as well as to javac to pick up those .jar files at runtime:

java -classpath :.:/usr/jdk/commons-net-3.0.1.jar:/usr/jdk/classes12.jar:/usr/jdk/mysql-connector-java-5.1.17-bin.jar:/usr/jdk/jtds-1.2.5.jar:/urs/jdk/mail.jar:/usr/jdk/joda-time-1.6.2.jar:/usr/jdk/commons-codec-1.4.jar:/usr/jdk/commons-logging-1.1.1.jar:/usr/jdk/httpclient-4.1.1.jar:/usr/jdk/httpclient-cache-4.1.1.jar:/usr/jdk/httpcore-4.1.jar:/usr/jdk/httpmime-4.1.1.jar:/usr/jdk/mailapi.jar:/usr/jdk/pop3.jar:/usr/jdk/smtp.jar:/usr/jdk/dsn.jar:/usr/jdk/imap.jar daily_transmission

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