java.io.IOException: Error while instrumenting

[Prabitha Susil]

Hi,

I am using org.jacoco.core-0.8.6.202001130357.jar, asm-8.0.1.jar with Java 8. While trying to read a .class files, i am getting error - java.io.IOException: Error while instrumenting.

Any pointers would be of great help.

Thanks,

Prabitha

[Marc Hoffmann]

Hi Prabitha,

please provide the full stack trace, this will probably show the root cause.

Regards,

-marc

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[Prabitha Susil]

Hi Marc,

Please find the full stack.

ava.io.IOException: Error while instrumenting oracle/apps/scm/productModel/items/ui/bean/ItemOverviewBean.
at org.jacoco.core.instr.Instrumenter.instrumentError(Instrumenter.java:159)
at org.jacoco.core.instr.Instrumenter.instrument(Instrumenter.java:109)
at org.jacoco.core.instr.Instrumenter.instrument(Instrumenter.java:134)
at ree.PerTestCoverageCollector$2.visitClassExecution(PerTestCoverageCollector.java:572)
at org.jacoco.core.data.ExecutionDataReader.readExecutionData(ExecutionDataReader.java:151)
at org.jacoco.core.data.ExecutionDataReader.readBlock(ExecutionDataReader.java:116)
at org.jacoco.core.data.ExecutionDataReader.read(ExecutionDataReader.java:93)
at ree.PerTestCoverageCollector.dump(PerTestCoverageCollector.java:692)
at ree.PerTestCoverageCollector.executeTest(PerTestCoverageCollector.java:211)
at ree.PerTestCoverageManager.main(PerTestCoverageManager.java:97)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 6
at org.jacoco.core.internal.instr.InstrSupport.getMajorVersion(InstrSupport.java:176)
at org.jacoco.core.internal.instr.InstrSupport.classReaderFor(InstrSupport.java:275)
at org.jacoco.core.instr.Instrumenter.instrument(Instrumenter.java:75)
at org.jacoco.core.instr.Instrumenter.instrument(Instrumenter.java:107)
... 8 more

The Code I was trying out is as below

public void dump(InputStream in) throws Exception {
File output_file = new File((configData.get("OUTPUT_FILE_DIR") + TESTCASE_NAME + "#"+configData.get("TEST_NUM")+(".txt")));
System.out.println("TestCase: "+TESTCASE_NAME);
System.out.println("OUTPUT_FILE_DIR: "+configData.get("OUTPUT_FILE_DIR"));
System.out.println(configData.get("OUTPUT_FILE_DIR") + TESTCASE_NAME + ".txt");
output_file.createNewFile();
final PrintStream out = new PrintStream(new FileOutputStream(output_file, false));

out.println("CLASS ID         HITS/PROBES   CLASS NAME");
System.out.println("INDATE in"+in);
//String results = new BufferedReader (new InputStreamReader(in)).lines().collect(Collectors.joining("\n"));
//System.out.println("INDATE"+results);
final ExecutionDataReader reader = new ExecutionDataReader(in);
reader.setSessionInfoVisitor(new ISessionInfoVisitor() {
public void visitSessionInfo(final SessionInfo info) {
out.printf("Session \"%s\": %s - %s%n", info.getId(), new Date(info.getStartTimeStamp()),
new Date(info.getDumpTimeStamp()));
}
});

reader.setExecutionDataVisitor(new IExecutionDataVisitor() {
public void visitClassExecution(final ExecutionData data) {
CLASS_NAME = data.getName();//"oracle/apps/scm/productModel/items/ui/bean/ItemOverviewBean";//
long CLASS_ID = data.getId();
Date todayDate = new Date();
final DateFormat sdf = new SimpleDateFormat("yyyy/MM/dd HH:mm:ss");
System.out.println("Today DAte is :" + sdf.format(todayDate));
System.out.println("CLASS_NAME:"+CLASS_NAME);
System.out.println("CLASS_ID:"+CLASS_ID);
//Test method level coverage
/*************************************************************************************/

// For instrumentation and runtime we need a IRuntime instance
       // to collect execution data:
try{
       final IRuntime runtime = new LoggerRuntime();

       // The Instrumenter creates a modified version of our test target class
       // that contains additional probes for execution data recording:
       final Instrumenter instr = new Instrumenter(runtime);
       InputStream original = getTargetClass();
       final byte[] instrumented = instr.instrument(original, CLASS_NAME);
       original.close();

       // Now we're ready to run our instrumented class and need to startup the
       // runtime first:
       final RuntimeData dataRunTime = new RuntimeData();
       runtime.startup(dataRunTime);

       // In this tutorial we use a special class loader to directly load the
       // instrumented class definition from a byte[] instances.
       final MemoryClassLoader memoryClassLoader = new MemoryClassLoader();
       memoryClassLoader.addDefinition(CLASS_NAME, instrumented);
       final Class<?> targetClass = memoryClassLoader.loadClass(CLASS_NAME);

       // Here we execute our test target class through its Runnable interface:
       final Runnable targetInstance = (Runnable) targetClass.newInstance();
       targetInstance.run();

       // At the end of test execution we collect execution data and shutdown
       // the runtime:
       final ExecutionDataStore executionData = new ExecutionDataStore();
       final SessionInfoStore sessionInfos = new SessionInfoStore();
       dataRunTime.collect(executionData, sessionInfos, false);
       runtime.shutdown();

       // Together with the original class definition we can calculate coverage
       // information:
       final CoverageBuilder coverageBuilder = new CoverageBuilder();
       final Analyzer analyzer = new Analyzer(executionData, coverageBuilder);
       original = getTargetClass();
       analyzer.analyzeClass(original, CLASS_NAME);
       original.close();

       // Let's dump some metrics and line coverage information:
       for (final IClassCoverage cc : coverageBuilder.getClasses()) {
           out.printf("Coverage of class %s%n", cc.getName());

           printCounter("instructions", cc.getInstructionCounter());
           printCounter("branches", cc.getBranchCounter());
           printCounter("lines", cc.getLineCounter());
           printCounter("methods", cc.getMethodCounter());
           printCounter("complexity", cc.getComplexityCounter());

           for (int i = cc.getFirstLine(); i <= cc.getLastLine(); i++) {
               out.printf("Line %s: %s%n", Integer.valueOf(i),
                       getColor(cc.getLine(i).getStatus()));
           }
       }
}catch(Exception e){
e.printStackTrace();

}
/***************************************************************************************/

}
//}
});
reader.read();
in.close();
System.out.println();
}
/** Currently hardcoded the file details to validate **/
public InputStream getTargetClass() throws Exception{
InputStream fs = new FileInputStream(CLASSPATH);
System.out.println(fs.toString());
String results = new BufferedReader (new InputStreamReader(fs)).lines().collect(Collectors.joining("\n"));
System.out.println("INDATE"+results);
return fs;
}

Thanks,

Prabitha

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[Marc Hoffmann]

Hallo Prabita,

the exception shows, that the class file ist too short, basically does not even have a version header. The reason is the implementation of your getTargetClass() method:

/** Currently hardcoded the file details to validate **/
public InputStream getTargetClass() throws Exception{
InputStream fs = new FileInputStream(CLASSPATH);
System.out.println(fs.toString());
String results = new BufferedReader (new InputStreamReader(fs)).lines().collect(Collectors.joining("\n"));
System.out.println("INDATE"+results);
return fs;
}

The method consumes all content from the InputStream and returns the same stream instance. Therefore there is nothing left to read.

Regards,

-marc

On 25. Aug 2022, at 06:19, Prabitha Susil <prabit...@gmail.com> wrote:

Hi Marc,

Please find the full stack.

ava.io.IOException: Error while instrumenting oracle/apps/scm/productModel/items/ui/bean/ItemOverviewBean.

at org.jacoco.core.instr.Instrumenter.instrumentError(Instrumenterita.java:159)

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[Prabitha Susil]

Thanks Marc that helped.. Is there a way to get the Method names from the class, that missed coverage?

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[Marc Hoffmann]

Hi Prabitha,

sure, you can use the API for this:

IClassCoverage cc = ...

for (final IMethodCoverage mc : cc.getMethods()) {
if (mc.getInstructionCounter().getMissedCount() > 0) {
System.out.println("Missed Coverage in " + mc.getName());
}
}

Regards,

-marc

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[Prabitha Susil]

thanks marc..  mc.getInstructionCounter().getMissedCount()  was not giving correct data, but tried  mc.getMethodCounter().getMissedCount(), that works.

Thanks a lot for the help

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