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From "Raghuram (JIRA)" <j...@codehaus.org>
Subject [jira] Created: (MCOMPILER-158) Symbol name should be displayed during compiler error using Java 7
Date Wed, 03 Aug 2011 04:38:42 GMT
Symbol name should be displayed during compiler error using Java 7
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                 Key: MCOMPILER-158
                 URL: https://jira.codehaus.org/browse/MCOMPILER-158
             Project: Maven 2.x Compiler Plugin
          Issue Type: Improvement
    Affects Versions: 2.3.2
            Reporter: Raghuram


Got to install Java 7.   Tried it out on some of our source code which uses maven.  Worked
fine till there was a compilation error.   

{code}
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile
(default-compile) on project my-app: Compilation failure
[ERROR] \work\my-app\src\main\java\com\mycompany\app\App.java:[11,45] error: cannot find symbol
[ERROR] -> [Help 1]
{code}

I am ok with the error, but which _symbol_ does it fail to find?   Tried the same thing with
Java 6.

{code}
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile
(default-compile) on project my-app: Compilation failure
[ERROR] \work\my-app\src\main\java\com\mycompany\app\App.java:[11,45] cannot find symbol
[ERROR] symbol  : variable Dummy
[ERROR] location: class com.mycompany.app.App
[ERROR] -> [Help 1]
{code}

 I can clearly see which variable is not found.  So what has changed? 

Tried *javac* on the class.  Output with java 7.

{code}
javac App.java
App.java:11: error: cannot find symbol
        System.out.println( "Hello World!" + Dummy);
                                             ^
  symbol:   variable Dummy
  location: class App
  1 error
{code}

Output with java 6.

{code}
javac App.java
    App.java:11: cannot find symbol
    symbol  : variable Dummy
    location: class com.mycompany.app.App
            System.out.println( "Hello World!" + Dummy);
                                                 ^
    1 error
{code}

We can see a couple of differences with Java 7 compiler compared to Java 6.

* Location does not show complete package, just the class
* Symbol and location now come after the line which has the error, instead of before.
* An additional "error" word comes before the error message

Essentially there is a change in compiler output in case of errors, which I guess needs a
corresponding maven compiler change. 

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