Unable to load properties file in Java using eclipse

[sarada bokka]

Hi All,

I am trying to run a standalone application which picks the robot.properties under src folder of eclipse

package com.xyz;
        Properties props ;
	public Resource()throws Exception
	{
		props = new Properties();
		String s= System.getProperty("user.dir");
		
		System.out.println(s);
		props.load(new FileInputStream("robot.properties"));
	}

Eclipse throws below error where Robot is the project name .
user.dir displays -C:\Eclipse\MyProjects\Robot


Exception in thread "main" java.io.FileNotFoundException: robot.properties

Thanks in advance.

[Campbell Ritchie]

Which directory do you have that file in?

[sarada bokka]

properties file is under src folder so eclipse tries to put in bin folder directly during compilation

[Christophe Verré]

First, FileInputStream is expecting a file path which has nothing to do with "user.dir". If the file path is an absolute path (e.g. /log/myfile), then it will pick up the file from that path. If the path is a relative path, like yours, it will look for a file starting from the current directory. So what it the current directory ? If you start your program from Eclipse, the current directory is by default the root directory of your project (this can be changes in the Run Configuration/Arguments/Working Directory). So the file in the "src" directory will not be found, unless you either:

Use "src/robot.properties" instead of "robot.properties"

or use the file's full path

or use a ResourceBundle to read your properties file and put your file in the classpath

[sarada bokka]

full path works fine i am able to get the properties file
but

If i do any modification in my project .Eclipse is unable to built/clear project again and throws error. It built only the files available in the path of properties file

[Christophe Verré]

throws error

What error ? Can you post the error message ?

[sarada bokka]

Caused by: java.lang.ClassNotFoundException: com.robot.Main

because it is unable to compile the classes any more .

1) I always need to delete the bin directory and then recompile when ever i modified my code.

When ever i modify the code and try to build .It just put only the properties file in the bin so i must repeat the step 1) for each modification i done.

[Christophe Verré]

because it is unable to compile the classes any more .

Why ? Did you check Project/Build Automatically ? Isn't there any error displayed ? If none, can you check if there are errors in the following file ${ECLIPSE_HOME}/workspace/.metadata/.log ?

[sarada bokka]

Yes,build automatic was checked.

One more thing this happens only if i do modification on property file else every thing works fine.

error in .log

!ENTRY org.eclipse.jdt.core 4 4 2010-04-15 16:57:12.937
!MESSAGE JavaBuilder handling ImageBuilderInternalException while building: Robot
!STACK 1
org.eclipse.core.internal.resources.ResourceException: Problems encountered while deleting resources.
at org.eclipse.core.internal.resources.Resource.delete(Resource.java:724)
at org.eclipse.jdt.internal.core.builder.IncrementalImageBuilder.findSourceFiles(IncrementalImageBuilder.java:659)
at org.eclipse.jdt.internal.core.builder.IncrementalImageBuilder.findSourceFiles(IncrementalImageBuilder.java:522)
at org.eclipse.jdt.internal.core.builder.IncrementalImageBuilder.findSourceFiles(IncrementalImageBuilder.java:522)
at org.eclipse.jdt.internal.core.builder.IncrementalImageBuilder.findSourceFiles(IncrementalImageBuilder.java:522)
at org.eclipse.jdt.internal.core.builder.IncrementalImageBuilder.findSourceFiles(IncrementalImageBuilder.java:473)
at org.eclipse.jdt.internal.core.builder.IncrementalImageBuilder.build(IncrementalImageBuilder.java:92)
at org.eclipse.jdt.internal.core.builder.JavaBuilder.buildDeltas(JavaBuilder.java:265)
at org.eclipse.jdt.internal.core.builder.JavaBuilder.build(JavaBuilder.java:193)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:633)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:170)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:201)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:253)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:256)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:309)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:341)
at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:140)
at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:238)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
Contains: Could not delete 'C:\Eclipse\MyProjects\Robot\bin\com\robot\util\robot.properties'.
!SUBENTRY 1 org.eclipse.core.resources 4 273 2010-04-15 16:57:12.937
!MESSAGE Problems encountered while deleting resources.
!SUBENTRY 2 org.eclipse.core.resources 4 273 2010-04-15 16:57:12.937
!MESSAGE Could not delete 'C:\Eclipse\MyProjects\Robot\bin\com\robot\util\robot.properties'.
!STACK 1
org.eclipse.core.runtime.CoreException: Problems encountered while deleting files.
at org.eclipse.core.internal.filesystem.local.LocalFile.delete(LocalFile.java:123)
at org.eclipse.core.internal.resources.ResourceTree.internalDeleteFile(ResourceTree.java:302)
at org.eclipse.core.internal.resources.ResourceTree.standardDeleteFile(ResourceTree.java:779)
at org.eclipse.core.internal.resources.Resource.unprotectedDelete(Resource.java:1720)
at org.eclipse.core.internal.resources.Resource.delete(Resource.java:711)
at org.eclipse.jdt.internal.core.builder.IncrementalImageBuilder.findSourceFiles(IncrementalImageBuilder.java:659)
at org.eclipse.jdt.internal.core.builder.IncrementalImageBuilder.findSourceFiles(IncrementalImageBuilder.java:522)
at org.eclipse.jdt.internal.core.builder.IncrementalImageBuilder.findSourceFiles(IncrementalImageBuilder.java:522)
at org.eclipse.jdt.internal.core.builder.IncrementalImageBuilder.findSourceFiles(IncrementalImageBuilder.java:522)
at org.eclipse.jdt.internal.core.builder.IncrementalImageBuilder.findSourceFiles(IncrementalImageBuilder.java:473)
at org.eclipse.jdt.internal.core.builder.IncrementalImageBuilder.build(IncrementalImageBuilder.java:92)
at org.eclipse.jdt.internal.core.builder.JavaBuilder.buildDeltas(JavaBuilder.java:265)
at org.eclipse.jdt.internal.core.builder.JavaBuilder.build(JavaBuilder.java:193)
at org.eclipse.core.internal.events.BuildManager$2.run(BuildManager.java:633)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:170)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:201)
at org.eclipse.core.internal.events.BuildManager$1.run(BuildManager.java:253)
at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:37)
at org.eclipse.core.internal.events.BuildManager.basicBuild(BuildManager.java:256)
at org.eclipse.core.internal.events.BuildManager.basicBuildLoop(BuildManager.java:309)
at org.eclipse.core.internal.events.BuildManager.build(BuildManager.java:341)
at org.eclipse.core.internal.events.AutoBuildJob.doBuild(AutoBuildJob.java:140)
at org.eclipse.core.internal.events.AutoBuildJob.run(AutoBuildJob.java:238)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
Contains: Could not delete: C:\Eclipse\MyProjects\Robot\bin\com\robot\util\robot.properties.
!SUBENTRY 3 org.eclipse.core.filesystem 4 273 2010-04-15 16:57:12.937
!MESSAGE Problems encountered while deleting files.
!SUBENTRY 4 org.eclipse.core.filesystem 4 273 2010-04-15 16:57:12.937
!MESSAGE Could not delete: C:\Eclipse\MyProjects\Robot\bin\com\robot\util\robot.properties.

[Christophe Verré]

Make sure you're not editing the file under "bin". Edit the one under "src". If you're not, the easiest way to avoid this would be to put your properties file in a different folder, not under "src".

[sarada bokka]

I am not editing the file under bin.

The problem was solved by placing in a different folder, not under "src"

Thank you so much Christophe