Eclipse - 由于缺少行号属性，无法安装断点 [英] Eclipse - Unable to install breakpoint due to missing line number attributes

问题描述

 无法插入断点缺席行号信息
  

我勾选了编译器选项的复选框，但没有运气。

解决方案

我在Eclipse 3.4.1中有相同的错误消息，SUN JVM1.6.0_07连接到Tomcat 6.0（在不同的机器上以调试模式运行，Sun JVM1。 6.0_16，调试连接正常工作）。

窗口 - >首选项 - > Java - >编译器 - >类文件生成：添加已经检查了生成的类文件的行号属性。我做了一个干净，重新编译。我没有选中它，重新编译，检查它，重新编译。我确保项目确实使用了全局设置。仍然是同样的消息。

我切换到ant构建，使用

 < javac srcdir =./ src / javadestdir =./ bindebug =true> 
  

仍然是同样的消息。

没有发现什么导致这个消息，为什么它不会消失。虽然它似乎与运行的Tomcat调试会话有关：断开连接后，重新编译可以解决问题。但是，在将调试器连接到Tomcat或在连接的调试会话期间设置新的断点时，它再次出现。

但是，结果是消息错误：我确实能够在调试之前和期间调试和设置断点（ javap -l <​​/ em>也显示行号）。所以只是忽略它：）

I am getting this strange error in Eclipse while trying to set a breakpoint.

Unable to insert breakpoint Absent Line Number Information

I ticked the checkbox from Compiler options but no luck.

解决方案

I had the same error message in Eclipse 3.4.1, SUN JVM1.6.0_07 connected to Tomcat 6.0 (running in debug-mode on a different machine, Sun JVM1.6.0_16, the debug connection did work correctly).

Window --> Preferences --> Java --> Compiler --> Classfile Generation: "add line number attributes to generated class file" was checked. I did a clean, recompile. I did uncheck it, recompile, check it, recompile. I made sure the project did use the global settings. Still the same message.

I switched to ant build, using

<javac srcdir="./src/java" destdir="./bin" debug="true">

Still, same message.

I didn't find out what caused this message and why it wouldn't go away. Though it seemed to have something to do with the running Tomcat debug session: when disconnected, recompiling solves the issue. But on connecting the debugger to Tomcat or on setting new breakpoints during a connected debug session, it appeared again.

However, it turned out the message was wrong: I was indeed able to debug and set breakpoints, both before and during debugging (javap -l did show line numbers, too). So just ignore it :)

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