英文:
java -version throws "java.lang.ClassNotFoundException: "
问题
我在Debian上使用OpenJDK 11。每当我尝试运行 java -version 时，我会得到以下错误：
错误：找不到或加载主类
原因：java.lang.ClassNotFoundException：
然而，像这样运行是可以的：
/usr/lib/jvm/java-11-openjdk-amd64/bin/java -version
我已经检查了符号链接，它们都工作正常。如果 javac 能够工作，为什么 java 就不行呢？因为它们都在同一个文件夹中。我漏掉了什么吗？
当我尝试运行任何已编译的类时，我也会得到相同的错误。最近我尝试过切换到不同的JDK，但失败了，在那之前我没有遇到过这个问题。我的 $PATH 和 $JAVA_HOME 都设置正确。
英文:
I am using OpenJDK 11 on Debian. Whenever I try to run java -version, I get this:
Error: Could not find or load main class
Caused by: java.lang.ClassNotFoundException:
However, running like this works:
/usr/lib/jvm/java-11-openjdk-amd64/bin/java -version
I checked the symlinks, they all worked fine. If javac can work, why can't java, because both of them are in the same folder. What am I missing?
I get the same when trying to run any compiled classes. I recently tried (but failed) switching to a different JDK, before which I didn't have this problem. My $PATH and $JAVA_HOME are set correctly.
答案1
得分: 0
我终于找到了答案。我退了一步，并思考了我更改默认JDK时所采取的确切步骤。当我切换到13时，运行java会在我的屏幕上显示一堆初始设置，所以我按照某人的答案来抑制它，而这导致了错误。
我在我的.bash_profile中添加了这行代码来抑制它，将其注释掉，然后重新启动问题就解决了！
_SILENT_JAVA_OPTIONS="$_JAVA_OPTIONS" && unset _JAVA_OPTIONS && alias java='java "$_SILENT_JAVA_OPTIONS"'
专业提示：如果你遇到这样的错误，只需检查你可能搞乱了哪些环境变量。
英文:
I finally found the answer. I took a step back, and thought out the exact steps I took when I changed my default JDK. When I had switched to 13, running java would echo a bunch of init settings on my screen, so I followed somebody's answer to suppress it, and THAT caused the error.
I had added this line to my .bash_profile to suppress it, and commenting it out followed by a reboot just solved the problem!
_SILENT_JAVA_OPTIONS="$_JAVA_OPTIONS" && unset _JAVA_OPTIONS && alias java='java "$_SILENT_JAVA_OPTIONS"'
PRO-TIP: If you're getting such errors, simply check which Environment variables could you have messed up with.
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