How to suppress Java warnings for specific directories or files such as generated code

Question

I\'m using a parser generator that creates somewhat ugly code. As a result my Eclipse project has several dozen warnings emanating from generated source files. I know I can

Answer 1

I think the best you can do is enable project specific settings for displaying warnings.

Window -> Preferences -> Java -> Compiler -> Errors/Warnings

On the top of the form is a link for configuring project specific settings.

Answer 2

It's been a while since I have released the warning-cleaner plugin, and now that I am using Eclipse 3.8, I have no need for it anymore. However, for those who still need this plugin, I have released it on github with the update site on bintray. If you are still using Eclipse 3.7 or before, this could be useful. Check this site for installation details.

Answer 3

I solved this by using the maven regexp replace plugin - it does not solve the cause, but heals the pain:

<plugin>
  <groupId>com.google.code.maven-replacer-plugin</groupId>
  <artifactId>maven-replacer-plugin</artifactId>
  <version>1.3.2</version>
  <executions>
<execution>
  <phase>prepare-package</phase>
  <goals>
    <goal>replace</goal>
  </goals>
</execution>
  </executions>
  <configuration>
<includes>
  <include>target/generated-sources/antlr/**/*.java</include>
</includes>

<regex>true</regex>
<regexFlags>
  <regexFlag>MULTILINE</regexFlag>
</regexFlags>

<replacements>
  <replacement>
    <token>^public class</token>
    <value>@SuppressWarnings("all") public class</value>
  </replacement>
</replacements>
  </configuration>
</plugin>

Note that I did not manage to get the ** notation to work, so you might have to specify path exactly.

See comment below for an improvement on how not to generate duplicate @SupressWarnings

Answer 4

I'm doing this to a few ANTLR grammars, which generate a Java parser using Ant. The Ant build script adds the @SuppressWarnings("all") to one Java file, and @Override to a few methods in another. I can look up how it's done exactly, if you're interested.

Answer 5

This can be done by excluding certain directories from the build path (The following example is given using Eclipse 3.5)

[1] Bring up the Java Build Path

• Click on the projectin Package Explorer
• Right click, properties
• Select Java Build Path

[2] Add directories to exclude

• The Source tab should contain details of the project source folders
• Expand the source folder and locate the 'Excluded:' property
• Select 'Excluded:' and click Edit
• Add folders into the Exclusion patterns using the Add/Add Multiple options
• Click Finish, then ok for Eclipse to rebuild.

Answer 6

If the eclipse project is generated from gradle using Eclipse plugin's eclipse command the Selectively ignore errors/warnings from source folders option can be set by adding this on the top level of you build.gradle file:

eclipse.classpath.file {
    whenMerged { classpath ->
        classpath.entries.each { entry -> 
            if (entry.path.contains('build/generated/parser')) {
                entry.entryAttributes['ignore_optional_problems'] = true
            }
        }
    }
}

This assumes that generated sources are in build/generated/parser folder.