如果其他方法都不起作用，打开调试透视图，清除所有现有的断点，然后重新设置它们。

这里有详细的解释:

https://github.com/spring-projects/spring-ide/issues/78

只是为了将来参考，这是答案的相关部分(忽略引用Spring Boot应用程序的事实，在许多其他情况下行为是相同的):

Whenever you set a breakpoint in Eclipse/STS, the IDE tries to set the breakpoint in the VM if you launch an app. That is what happens in your case when you run the boot app in debug mode. For each class that gets loaded into the JVM, the IDE checks whether it needs to set a breakpoint or not. If it decides to set the breakpoint, the tries to do so (using the information from the breakpoint definition in the IDE, including its line number, since you usually set line breakpoints on a source file at a given line). This decision (whether to set the breakpoint on a given loaded class or not) checks the types that you set the breakpoint on, enclosing types, and inner classes. This makes sure that breakpoints for inner classes (even anonymous inner classes) are set to the JVM (and are not ignored). Spring Boot generates an inner class for your controller at runtime (this is the CGLIB generated inner class that appears in the error message). When the JVM loads that class, it tries to set the line number breakpoint of the enclosing type (for this inner class). Since the generated inner class doesn't have any line number information (it doesn't need to have line number information), setting the breakpoint fails for this inner class with the mentioned error message. When the IDE loads the enclosing type (your controller class itself), it also tries to set the line breakpoint and succeeds with that. This is visualized with the check marker on the breakpoint marker. Therefore you can safely ignore the error message that shows up. To avoid this error message to show up, you can go to the preferences (Java -> Debug) and disable "Warn when unable to install breakpoint due to missing line number attributes".

不知道这是否仍然相关，也许另一个水手会发现这有用。

当已编译的类文件关闭调试标志时，将出现该消息。

在eclipse中，您可以通过前面提到的选项打开它，

窗口—>首选项—> Java—>编译器—>类文件生成:“添加行号属性生成类文件”

但是如果您有一个jar文件，那么您将得到编译后的输出。解决这个问题没有简单的方法。

如果您可以访问源代码并使用ant来获取jar文件，那么您可以如下所示修改ant任务。

  <javac  destdir="${build.destDir}" srcdir="${build.srcDir}" source="1.6" fork="true" target="${javac.target}" debug="on" debuglevel="lines,vars,source" deprecation="on" memoryInitialSize="512m" memoryMaximumSize="1024m" optimize="true"   >

快乐的调试. .

裁判: http://doc.sumy.ua/prog/Java/javanut/ch16_04.htm

我尝试了之前的大部分解决方案，但还是遇到了问题。 这就是我接下来所做的:

从Eclipse中删除应用程序 停止服务器 从webapps中删除应用文件夹 从服务器中的临时文件夹中删除内容 从服务器中的工作文件夹中删除内容 在Eclipse上重新打开应用程序 启动服务器

可能有些步骤是不需要的，但“以防万一”。

因此，如果前面的解决方案仍然不适合你。试试这个。 我希望这对你有所帮助;-)

以上这些都对我不起作用。 下面的解决方案终于奏效了。 调试配置->类路径->用户条目->(添加要调试的项目的src文件夹)

我在一个特定的项目中遇到了同样的问题，我一直试图重置窗口中的行号属性->首选项…然后我意识到每个项目都有自己的行号属性设置。右键单击项目，进入属性，选择JavaCompiler，并选中“添加行号属性…”