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".

在编译/构建jar时，我做了上面列出的所有事情-仍然有同样的问题。

最终，在启动服务器时，下面列出的jvmarg更改最终为我工作:

删除/注释了一堆与javaagent和bootclasspath相关的jvm参数。

<!-- jvmarg value=“${agentfile}” /-->

< !贾维德- lib /雷丁——>

<!-- jvmarg value=“-Xbootclasspath/a：/foo /-->

打开/取消注释以下行:

<jvmarg value= -Xdebug />

然后，当我启动服务器时，我就可以到达断点了。我怀疑javaagent在某种程度上干扰了Eclipse检测行号的能力。

检查/做以下事情:

1)在“窗口—>首选项—> Java—>编译器—>类文件生成”下，所有选项必须为True:

(1) Add variable attributes...
(2) Add line number attributes...
(3) Add source file name...
(4) Preserve unused (never read) local variables

2)在项目的.settings文件夹中，找到一个名为org.eclipse.jdt.core.prefs的文件。 验证或设置org.eclipse.jdt.core.compiler.debug.lineNumber=generate

3)如果仍然出现错误窗口，单击复选框不显示错误信息。

4)清洁和建造项目。开始调试。

正常情况下，错误窗口不再显示，调试信息显示正确。

因为我安装了6个不同版本的Java，所以我必须更改默认的JDK遵从性，以匹配我想使用的Java版本。当所有内容都使用Java 1.6构建/编译时，Eclipse默认将编译器遵从级别设置为Java 1.7。

所以我所做的就是

在eclipse菜单中，进入“窗口->首选项->Java->编译器” 在JDK遵从性下，我将编译器遵从性级别从1.7更改为1.6

现在Eclipse不再抱怨“无法插入缺少行号信息的断点”，并且调试断点实际上工作了!!

在调试部署到Tomcat的WAR(由多个Eclipse项目构件构造)时，我遇到了同样的问题。

我正在使用ANT构建脚本构建所有内容。如果这是您正在做的事情，请确保在您获得的每个javac ant任务上设置了debug=true标志。这是我唯一的问题-我希望它能帮助你的问题!

有一次我在使用junit和Mockito时遇到了同样的错误，我忘记为静态类添加@PrepareForTest。

添加以下代码修复了我的问题。

@PrepareForTest({XXXXX.class})

不确定是不是同一个案子。