"Debugging in the source code results in a NullPointerException."

Liquibase Development
1

Hello everyone, I’m a beginner. I encountered an error while debugging the Liquibase source code. Below is the code I’m debugging and the exception message. Can any experts help me out?

@Test
    public void liTest(){

        //jdbc:mysql://localhost:3306/datawarehouse
        //"--url=jdbc:gbase://0.0.0.0:8888/datawarehouse",

                String[] commandLineArgs = {
                "--driver=com.gbase.jdbc.Driver",
                "--classpath=/Users/liyangzhou/cdrcb/lib/gbase-connector-java-8.3.81.53-build52.8-bin.jar",
                "--url=jdbc:mysql://localhost:3306/datawarehouse",
                "--username=dwh",
                "--password=dwh",
                "generateChangeLog",
                "--outputFile=/Users/liyangzhou/cdrcb/dw/changelog-output.xml",
               "--log-level=debug"
        };

        LiquibaseCommandLine liquibaseCommandLine = new LiquibaseCommandLine();
        // Run the Liquibase command
        int exitCode = liquibaseCommandLine.execute(commandLineArgs);

        // Check the exit code to determine success or failure
        if (exitCode == 0) {
            System.out.println("Changelog generated successfully.");
        } else {
            System.err.println("Changelog generation failed.");
        }


java.lang.NullPointerException
	at liquibase.integration.commandline.LiquibaseCommandLine.logMdcData(LiquibaseCommandLine.java:427)
	at liquibase.integration.commandline.LiquibaseCommandLine.lambda$null$2(LiquibaseCommandLine.java:381)
	at liquibase.Scope.child(Scope.java:206)
	at liquibase.Scope.child(Scope.java:182)
	at liquibase.integration.commandline.LiquibaseCommandLine.lambda$execute$3(LiquibaseCommandLine.java:358)
	at liquibase.Scope.child(Scope.java:206)
	at liquibase.Scope.child(Scope.java:182)
	at liquibase.integration.commandline.LiquibaseCommandLine.execute(LiquibaseCommandLine.java:356)
	at liquibase.LiquibaseCommandLineTest.liyangzhouTest(LiquibaseCommandLineTest.java:84)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
	at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63)
	at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329)
	at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293)
	at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:413)
	at org.junit.runner.JUnitCore.run(JUnitCore.java:137)
	at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69)
	at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:33)
	at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:221)
	at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:54)
Changelog generation failed.
2

Hello windsors,

I was unable to replicate this issue with your code. What version of Liquibase are you using? Based on source code line mismatch, I think it might be useful for you to try with the latest.

Thanks,
Wesley