错误：无法在 Eclipse 中找到或加载主类
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Error: Could not find or load main class in Eclipse
提问by Zach Latta
I'm having trouble running a project in Eclipse 4.2. I have a Java program with one class titled Conversion. Eclipse builds the project fine. I'm able to run the program from the command line by navigating to /bin/ in the project's folder that's in the workspace and typing java Conversion.
我在 Eclipse 4.2 中运行项目时遇到问题。我有一个 Java 程序，其中包含一个名为 Conversion 的类。Eclipse 可以很好地构建项目。我可以通过导航到工作区中项目文件夹中的 /bin/ 并键入java Conversion.
However, when I try to run the program from Eclipse, I am shown Error: Could not find or load main class Conversionin the console.
但是，当我尝试从 Eclipse 运行该程序时，我会显示Error: Could not find or load main class Conversion在控制台中。
The project name is 10.12.12: Project.
项目名称是10.12.12: Project.
采纳答案by Zach Latta
Eclipse does not support the use of a colon or hyphen in project names. Colons appear to break the way it handles compilation.
Eclipse 不支持在项目名称中使用冒号或连字符。冒号似乎打破了它处理编译的方式。
The issue can be fixed by not using a colon in the project's name.
该问题可以通过不在项目名称中使用冒号来解决。
As noted in the comments, this may be a fault of Java 6. It is fixed in Java 7.
如评论中所述，这可能是 Java 6 的错误。它在 Java 7 中已修复。
回答by Cratylus
It appears that the project is not part of the classpath.
Check in your Run Configuration->Classpathand if your project is not there, then add it under User Entries.
该项目似乎不是类路径的一部分。
检查Run Configuration->Classpath您的项目，如果您的项目不存在，则将其添加到User Entries.
回答by rizwan
Make sure the build path is configured properly in the eclipse. Paths for the external JAR files may be wrong.
确保在 eclipse 中正确配置了构建路径。外部 JAR 文件的路径可能有误。
回答by FederOnline
I understand the ':' was likely the case here, but I had a tangential issue that might help someone else.
我理解 ':' 可能是这里的情况，但我有一个可能对其他人有帮助的切线问题。
I inherited a project and was having a similar issue. Dev/Debugging is on Mac/Win, and the TST/UAT/PRD environment is RHEL. Someone literally copied the systemd command line and left a '\' in the Debug arguments. The reason this was hard to find is that the lines wrap right at the -D, so the \ is the last char on a line, which looks OK under Linux. I fixed it like this...
我继承了一个项目并且遇到了类似的问题。Dev/Debugging在Mac/Win上，TST/UAT/PRD环境是RHEL。有人从字面上复制了 systemd 命令行，并在 Debug 参数中留下了一个“\”。很难找到的原因是这些行在 -D 处自动换行，所以 \ 是一行中的最后一个字符，在 Linux 下看起来不错。我是这样修的...
In my case it was...
就我而言，它是...
-Dlog4j.configurationFile=file:<PATH>/log4j2.xml \
-DCONFIG_PATH=...
Right-Click Project -> Run-As/Debug-As, click the Arguments Tab.
In the VM Arguments, look for \.
HTH.
哈。
回答by Veerendar Chary Munigadapa
This Problem will accrues Saving file name one name and compile time u have gives another name. That time you will get that problem. Check the java file name once.
这个问题将累积保存文件名一个名称和编译时间你给出另一个名称。到时候你就会遇到那个问题。检查一次 java 文件名。
