getCanonicalPath on link returns invalid result

Name: rmT116609 Date: 08/10/2004


FULL PRODUCT VERSION :
java version "1.4.2_04"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2_04-b05)
Java HotSpot(TM) Client VM (build 1.4.2_04-b05, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Linux totoro 2.4.19-4GB #1 Fri Apr 2 19:59:17 UTC 2004 i686 unknown

A DESCRIPTION OF THE PROBLEM :
getCanonicalPath on a link returns the path to the link instead of the link's target if getCanonicalPath was called before the link is actually created.

If you comment out line 23 of the test code the correct path is returned.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1) Compile the attached unit test
2) Execute the unit test (e.g. java -classpath .:junit.jar junit.textui.TestRunner LinkTest)


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The unit test should succeed.
ACTUAL -
The unit test fails.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
.F
Time: 0.164
There was 1 failure:
1) testGetCanonicalPath(LinkTest)junit.framework.ComparisonFailure: expected:<..
.target> but was:<...link>
        at LinkTest.testGetCanonicalPath(LinkTest.java:48)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)

FAILURES!!!
Tests run: 1, Failures: 1, Errors: 0

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.io.*;
import junit.framework.*;

public class LinkTest
    extends TestCase
{
    private File linkFile, targetFile;

    public LinkTest()
    {
        super("LinkTest");
    }

    public void setUp()
        throws Exception
    {
        String dir = System.getProperty("user.home");
            
        linkFile = new File(dir, "link");
        targetFile = new File(dir, "target");

        // This line seems to be the cause of the problem.
        linkFile.getCanonicalPath();

        assertTrue(targetFile.createNewFile());
            
        String[] cmd = {
            "ln",
            "-s",
            targetFile.getAbsolutePath(),
            linkFile.getAbsolutePath(),
        };
        
        Process p = Runtime.getRuntime().exec(cmd);

        p.waitFor();
    }
    
    public void tearDown()
    {
        linkFile.delete();
        targetFile.delete();
    }

    public void testGetCanonicalPath()
        throws IOException
    {
        assertEquals(targetFile.getAbsolutePath(), linkFile.getCanonicalPath());
    }
}

---------- END SOURCE ----------
(Incident Review ID: 284849)
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