[
https://issues.apache.org/jira/browse/CONFIGURATION-497?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Kate Butler closed CONFIGURATION-497.
-------------------------------------
Resolution: Not A Problem
> PropertiesConfiguration.setProperty() with auto-save returns before file
> handle is closed
> -----------------------------------------------------------------------------------------
>
> Key: CONFIGURATION-497
> URL: https://issues.apache.org/jira/browse/CONFIGURATION-497
> Project: Commons Configuration
> Issue Type: Bug
> Components: File reloading
> Affects Versions: 1.6, 1.8
> Reporter: Kate Butler
> Priority: Minor
> Attachments: commons-configuration-497.patch
>
>
> I have an application which stores some counters in a PropertiesConfiguration
> with auto-save enabled. These counters are incremented regularly - during
> peak load the PropertiesConfiguration object will be updated every 5
> milliseconds on average, and there will also be threads reading from it at
> the same time. All access to the PropertiesConfiguration is made through a
> wrapper class which enforces synchronization.
> About one in every 8,000 calls to setProperty() will fail, seemingly because
> the file handle is still open from the previous call. I have a
> single-threaded test case which can reproduce this by writing continuously to
> a PropertiesConfiguration object - it usually fails within 10,000 iterations
> and has never successfully completed 500,000 iterations.
> {code:title=Test Case|borderStyle=solid}
> public void testHeavyLoadWritingToConf() throws ConfigurationException {
> PropertiesConfiguration conf = new PropertiesConfiguration(new
> java.io.File(FILE_PATH));
> conf.setAutoSave(true);
>
> for (int i = 0; i < NUM_WRITES; i++) {
> if (i % 100 == 0 && i > 0) {
> System.out.println("Test has completed " + i + " iterations");
> }
> conf.setProperty("my.counter", i);
> }
> System.out.println("All writes successful");
> }
> {code}
> {code:title=Stack trace|borderStyle=solid}
> org.apache.commons.configuration.ConfigurationRuntimeException: Failed to
> auto-save
> at
> org.apache.commons.configuration.AbstractFileConfiguration.possiblySave(AbstractFileConfiguration.java:753)
> at
> org.apache.commons.configuration.AbstractFileConfiguration.clearProperty(AbstractFileConfiguration.java:799)
> at
> org.apache.commons.configuration.AbstractConfiguration.setProperty(AbstractConfiguration.java:485)
> at
> org.apache.commons.configuration.AbstractFileConfiguration.setProperty(AbstractFileConfiguration.java:788)
> at
> com.magicmemories.spike.PersistenceLockingTest.testHeavyLoadWritingToConf(PersistenceLockingTest.java:27)
> at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> at
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> at
> sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
> at java.lang.reflect.Method.invoke(Method.java:597)
> at junit.framework.TestCase.runTest(TestCase.java:168)
> at junit.framework.TestCase.runBare(TestCase.java:134)
> at junit.framework.TestResult$1.protect(TestResult.java:110)
> at junit.framework.TestResult.runProtected(TestResult.java:128)
> at junit.framework.TestResult.run(TestResult.java:113)
> at junit.framework.TestCase.run(TestCase.java:124)
> at junit.framework.TestSuite.runTest(TestSuite.java:232)
> at junit.framework.TestSuite.run(TestSuite.java:227)
> at
> org.junit.internal.runners.JUnit38ClassRunner.run(JUnit38ClassRunner.java:79)
> at
> org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50)
> at
> org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
> at
> org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)
> Caused by: org.apache.commons.configuration.ConfigurationException: Unable to
> save to file C:\testarea\test.properties
> at
> org.apache.commons.configuration.DefaultFileSystem.getOutputStream(DefaultFileSystem.java:139)
> at
> org.apache.commons.configuration.DefaultFileSystem.getOutputStream(DefaultFileSystem.java:95)
> at
> org.apache.commons.configuration.AbstractFileConfiguration.save(AbstractFileConfiguration.java:473)
> at
> org.apache.commons.configuration.AbstractFileConfiguration.save(AbstractFileConfiguration.java:414)
> at
> org.apache.commons.configuration.AbstractFileConfiguration.possiblySave(AbstractFileConfiguration.java:749)
> ... 23 more
> Caused by: java.io.FileNotFoundException: C:\testarea\test.properties (The
> process cannot access the file because it is being used by another process)
> at java.io.FileOutputStream.open(Native Method)
> at java.io.FileOutputStream.<init>(FileOutputStream.java:194)
> at java.io.FileOutputStream.<init>(FileOutputStream.java:145)
> at
> org.apache.commons.configuration.DefaultFileSystem.getOutputStream(DefaultFileSystem.java:135)
> ... 27 more
> {code}
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