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You've provided no details of the affected code, so we can't tell you precisely what the problem is.
All we can tell you is that a NullPointerException means that somewhere in your code you are trying to access a member of an object which has not been initialized, and is set to null.
You need to debug your code to find out what object is null when it shouldn't be. Then work out why it hasn't been initialized.
We can't do that for you.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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here is the file 11_Test.zero
{
"scenarioName": "Cleanup dr network",
"steps": [
// source1
{
"name": "step1_source1",
"url": "com.storvisor.backup.TestPreconditions",
"operation": "drNetworkCleanup",
"request": {
"____test_step": "1a_p001_cleanup_network_step1_source1",
"X-OperationID": "${RANDOM.NUMBER}", // actually System.currentTimeMillis()
"stdatasvcmgr": "http://10.198.74.45:9339/stdatasvcmgr",
"user": "[:]",
"rootsessionid": "564d1ec7-b0ec-e9d0-445f-7455b4d1bcdd-12532"
},
"assertions": {
"result": true
}
},
// source2
{
"name": "step1_source2",
"url": "com.storvisor.backup.TestPreconditions",
"operation": "drNetworkCleanup",
"request": {
"____test_step": "1a_p001_cleanup_network_step1_source2",
"X-OperationID": "${RANDOM.NUMBER}", // actually System.currentTimeMillis()
"stdatasvcmgr": "http://10.198.73.61:9339/stdatasvcmgr",
"user": "[:]",
"rootsessionid": "564dc67c-1f45-7270-6795-32a72f436514-23376"
},
"assertions": {
"result": true
}
},
// target
{
"name": "step1_target",
"url": "com.storvisor.backup.TestPreconditions",
"operation": "drNetworkCleanup",
"request": {
"____test_step": "1a_p001_cleanup_network_step1_target",
"X-OperationID": "${RANDOM.NUMBER}", // actually System.currentTimeMillis()
"stdatasvcmgr": "http://10.198.73.67:9339/stdatasvcmgr",
"user": "[:]",
"rootsessionid": "564dc295-844a-89ad-091e-6033987ce14b-29868"
},
"assertions": {
"result": true
}
}
]
}
under zerocode directory
File :myTest.java
------------------
package com.storvisor.backup;
import static org.junit.Assert.*;
import org.jsmart.zerocode.core.domain.JsonTestCase;
import org.jsmart.zerocode.core.domain.TargetEnv;
import org.jsmart.zerocode.core.runner.ZeroCodeUnitRunner;
import org.junit.FixMethodOrder;
import org.junit.Ignore;
import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.Timeout;
import org.junit.runner.RunWith;
import org.junit.runners.MethodSorters;
@TargetEnv("test.properties")
@FixMethodOrder(MethodSorters.NAME_ASCENDING)
@RunWith(PolicyTestUnitRunner.class)
public class myTest {
@Rule
public Timeout globalTimeout = Timeout.seconds(120);
@Test @JsonTestCase("zerocode/11_Test.zero")
public void _11_Test() throws Exception {}
}
---------------------------
PolicyTestUnitRunner.java
----------------------------
package com.storvisor.backup;
import org.jsmart.zerocode.core.runner.ZeroCodeUnitRunner;
import org.junit.runner.notification.RunNotifier;
import org.junit.runners.model.InitializationError;
public class PolicyTestUnitRunner extends ZeroCodeUnitRunner
{
public PolicyTestUnitRunner(Class klass) throws InitializationError
{
super(klass);
}
@Override
public void run(RunNotifier notifier)
{
PolicyTestListener failFastListener = new PolicyTestListener(notifier);
notifier.addListener(failFastListener);
super.run(notifier);
}
}
Thanks
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Also Observed it is executing till source afterward it is throughing Java Runtime Exception
java.lang.RuntimeException: ZeroCode Step execution failed. Details:java.lang.NullPointerException
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source1 is worked perfectly when it start consume soure2 it is througing
java.lang.RuntimeException: ZeroCode Step execution failed. Details:java.lang.NullPointerException.
Can you please let me know what is wrong on zero file
Thanking you
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No one here can tell you what is wrong with your file since we have no idea what the data represents. Also we have no idea where ther exception occurs, or why the variable in question has not been initialised. You are the only person that can diagnose the problem, by using the debugger, and examining what is happening when the code runs.
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Member 16085274 wrote: Could you please suggest what is wrong.
The stack trace will tell you the exact line with the null pointer.
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* What went wrong:
Execution failed for task ':backup:integration_test'.
> There were failing tests. See the report at: file:
* Try:
> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
* Exception is:
org.gradle.api.tasks.TaskExecutionException: Execution failed for task ':backup:integration_test'.
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.lambda$executeIfValid$1(ExecuteActionsTaskExecuter.java:149)
at org.gradle.internal.Try$Failure.ifSuccessfulOrElse(Try.java:282)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:147)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:135)
at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46)
at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:51)
at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57)
at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:74)
at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)
at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77)
at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55)
at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)
at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:204)
at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:199)
at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:66)
at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:59)
at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:157)
at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:59)
at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:53)
at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:73)
at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52)
at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:42)
at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:338)
at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:325)
at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:318)
at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:304)
at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:463)
at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:380)
at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:49)
Caused by: org.gradle.api.tasks.VerificationException: There were failing tests. See the report at: file: at org.gradle.api.tasks.testing.AbstractTestTask.handleTestFailures(AbstractTestTask.java:621)
at org.gradle.api.tasks.testing.AbstractTestTask.handleCollectedResults(AbstractTestTask.java:483)
at org.gradle.api.tasks.testing.AbstractTestTask.executeTests(AbstractTestTask.java:478)
at org.gradle.api.tasks.testing.Test.executeTests(Test.java:685)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at org.gradle.internal.reflect.JavaMethod.invoke(JavaMethod.java:125)
at org.gradle.api.internal.project.taskfactory.StandardTaskAction.doExecute(StandardTaskAction.java:58)
at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:51)
at org.gradle.api.internal.project.taskfactory.StandardTaskAction.execute(StandardTaskAction.java:29)
at org.gradle.api.internal.tasks.execution.TaskExecution$3.run(TaskExecution.java:242)
at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:29)
at org.gradle.internal.operations.DefaultBuildOperationRunner$1.execute(DefaultBuildOperationRunner.java:26)
at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:66)
at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:59)
at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:157)
at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:59)
at org.gradle.internal.operations.DefaultBuildOperationRunner.run(DefaultBuildOperationRunner.java:47)
at org.gradle.internal.operations.DefaultBuildOperationExecutor.run(DefaultBuildOperationExecutor.java:68)
at org.gradle.api.internal.tasks.execution.TaskExecution.executeAction(TaskExecution.java:227)
at org.gradle.api.internal.tasks.execution.TaskExecution.executeActions(TaskExecution.java:210)
at org.gradle.api.internal.tasks.execution.TaskExecution.executeWithPreviousOutputFiles(TaskExecution.java:193)
at org.gradle.api.internal.tasks.execution.TaskExecution.execute(TaskExecution.java:166)
at org.gradle.internal.execution.steps.ExecuteStep.executeInternal(ExecuteStep.java:93)
at org.gradle.internal.execution.steps.ExecuteStep.access$000(ExecuteStep.java:44)
at org.gradle.internal.execution.steps.ExecuteStep$1.call(ExecuteStep.java:57)
at org.gradle.internal.execution.steps.ExecuteStep$1.call(ExecuteStep.java:54)
at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:204)
at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:199)
at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:66)
at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:59)
at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:157)
at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:59)
at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:53)
at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:73)
at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:54)
at org.gradle.internal.execution.steps.ExecuteStep.execute(ExecuteStep.java:44)
at org.gradle.internal.execution.steps.RemovePreviousOutputsStep.execute(RemovePreviousOutputsStep.java:67)
at org.gradle.internal.execution.steps.RemovePreviousOutputsStep.execute(RemovePreviousOutputsStep.java:37)
at org.gradle.internal.execution.steps.CancelExecutionStep.execute(CancelExecutionStep.java:41)
at org.gradle.internal.execution.steps.TimeoutStep.executeWithoutTimeout(TimeoutStep.java:74)
at org.gradle.internal.execution.steps.TimeoutStep.execute(TimeoutStep.java:55)
at org.gradle.internal.execution.steps.CreateOutputsStep.execute(CreateOutputsStep.java:50)
at org.gradle.internal.execution.steps.CreateOutputsStep.execute(CreateOutputsStep.java:28)
at org.gradle.internal.execution.steps.CaptureStateAfterExecutionStep.executeDelegateBroadcastingChanges(CaptureStateAfterExecutionStep.java:100)
at org.gradle.internal.execution.steps.CaptureStateAfterExecutionStep.execute(CaptureStateAfterExecutionStep.java:72)
at org.gradle.internal.execution.steps.CaptureStateAfterExecutionStep.execute(CaptureStateAfterExecutionStep.java:50)
at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:40)
at org.gradle.internal.execution.steps.ResolveInputChangesStep.execute(ResolveInputChangesStep.java:29)
at org.gradle.internal.execution.steps.BuildCacheStep.executeWithoutCache(BuildCacheStep.java:166)
at org.gradle.internal.execution.steps.BuildCacheStep.executeAndStoreInCache(BuildCacheStep.java:139)
at org.gradle.internal.execution.steps.BuildCacheStep.lambda$executeWithCache$4(BuildCacheStep.java:106)
at org.gradle.internal.execution.steps.BuildCacheStep.lambda$executeWithCache$5(BuildCacheStep.java:106)
at org.gradle.internal.Try$Success.map(Try.java:164)
at org.gradle.internal.execution.steps.BuildCacheStep.executeWithCache(BuildCacheStep.java:80)
at org.gradle.internal.execution.steps.BuildCacheStep.lambda$execute$0(BuildCacheStep.java:69)
at org.gradle.internal.Either$Left.fold(Either.java:115)
at org.gradle.internal.execution.caching.CachingState.fold(CachingState.java:59)
at org.gradle.internal.execution.steps.BuildCacheStep.execute(BuildCacheStep.java:68)
at org.gradle.internal.execution.steps.BuildCacheStep.execute(BuildCacheStep.java:46)
at org.gradle.internal.execution.steps.StoreExecutionStateStep.execute(StoreExecutionStateStep.java:36)
at org.gradle.internal.execution.steps.StoreExecutionStateStep.execute(StoreExecutionStateStep.java:25)
at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:36)
at org.gradle.internal.execution.steps.RecordOutputsStep.execute(RecordOutputsStep.java:22)
at org.gradle.internal.execution.steps.SkipUpToDateStep.executeBecause(SkipUpToDateStep.java:91)
at org.gradle.internal.execution.steps.SkipUpToDateStep.lambda$execute$2(SkipUpToDateStep.java:55)
at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:55)
at org.gradle.internal.execution.steps.SkipUpToDateStep.execute(SkipUpToDateStep.java:37)
at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:65)
at org.gradle.internal.execution.steps.ResolveChangesStep.execute(ResolveChangesStep.java:36)
at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:37)
at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsFinishedStep.execute(MarkSnapshottingInputsFinishedStep.java:27)
at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:76)
at org.gradle.internal.execution.steps.ResolveCachingStateStep.execute(ResolveCachingStateStep.java:37)
at org.gradle.internal.execution.steps.ValidateStep.execute(ValidateStep.java:94)
at org.gradle.internal.execution.steps.ValidateStep.execute(ValidateStep.java:49)
at org.gradle.internal.execution.steps.CaptureStateBeforeExecutionStep.execute(CaptureStateBeforeExecutionStep.java:71)
at org.gradle.internal.execution.steps.CaptureStateBeforeExecutionStep.execute(CaptureStateBeforeExecutionStep.java:45)
at org.gradle.internal.execution.steps.SkipEmptyWorkStep.executeWithNonEmptySources(SkipEmptyWorkStep.java:177)
at org.gradle.internal.execution.steps.SkipEmptyWorkStep.execute(SkipEmptyWorkStep.java:86)
at org.gradle.internal.execution.steps.SkipEmptyWorkStep.execute(SkipEmptyWorkStep.java:53)
at org.gradle.internal.execution.steps.RemoveUntrackedExecutionStateStep.execute(RemoveUntrackedExecutionStateStep.java:32)
at org.gradle.internal.execution.steps.RemoveUntrackedExecutionStateStep.execute(RemoveUntrackedExecutionStateStep.java:21)
at org.gradle.internal.execution.steps.legacy.MarkSnapshottingInputsStartedStep.execute(MarkSnapshottingInputsStartedStep.java:38)
at org.gradle.internal.execution.steps.LoadPreviousExecutionStateStep.execute(LoadPreviousExecutionStateStep.java:36)
at org.gradle.internal.execution.steps.LoadPreviousExecutionStateStep.execute(LoadPreviousExecutionStateStep.java:23)
at org.gradle.internal.execution.steps.CleanupStaleOutputsStep.execute(CleanupStaleOutputsStep.java:75)
at org.gradle.internal.execution.steps.CleanupStaleOutputsStep.execute(CleanupStaleOutputsStep.java:41)
at org.gradle.internal.execution.steps.AssignWorkspaceStep.lambda$execute$0(AssignWorkspaceStep.java:32)
at org.gradle.api.internal.tasks.execution.TaskExecution$4.withWorkspace(TaskExecution.java:287)
at org.gradle.internal.execution.steps.AssignWorkspaceStep.execute(AssignWorkspaceStep.java:30)
at org.gradle.internal.execution.steps.AssignWorkspaceStep.execute(AssignWorkspaceStep.java:21)
at org.gradle.internal.execution.steps.IdentityCacheStep.execute(IdentityCacheStep.java:37)
at org.gradle.internal.execution.steps.IdentityCacheStep.execute(IdentityCacheStep.java:27)
at org.gradle.internal.execution.steps.IdentifyStep.execute(IdentifyStep.java:42)
at org.gradle.internal.execution.steps.IdentifyStep.execute(IdentifyStep.java:31)
at org.gradle.internal.execution.impl.DefaultExecutionEngine$1.execute(DefaultExecutionEngine.java:64)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.executeIfValid(ExecuteActionsTaskExecuter.java:146)
at org.gradle.api.internal.tasks.execution.ExecuteActionsTaskExecuter.execute(ExecuteActionsTaskExecuter.java:135)
at org.gradle.api.internal.tasks.execution.FinalizePropertiesTaskExecuter.execute(FinalizePropertiesTaskExecuter.java:46)
at org.gradle.api.internal.tasks.execution.ResolveTaskExecutionModeExecuter.execute(ResolveTaskExecutionModeExecuter.java:51)
at org.gradle.api.internal.tasks.execution.SkipTaskWithNoActionsExecuter.execute(SkipTaskWithNoActionsExecuter.java:57)
at org.gradle.api.internal.tasks.execution.SkipOnlyIfTaskExecuter.execute(SkipOnlyIfTaskExecuter.java:74)
at org.gradle.api.internal.tasks.execution.CatchExceptionTaskExecuter.execute(CatchExceptionTaskExecuter.java:36)
at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.executeTask(EventFiringTaskExecuter.java:77)
at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:55)
at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter$1.call(EventFiringTaskExecuter.java:52)
at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:204)
at org.gradle.internal.operations.DefaultBuildOperationRunner$CallableBuildOperationWorker.execute(DefaultBuildOperationRunner.java:199)
at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:66)
at org.gradle.internal.operations.DefaultBuildOperationRunner$2.execute(DefaultBuildOperationRunner.java:59)
at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:157)
at org.gradle.internal.operations.DefaultBuildOperationRunner.execute(DefaultBuildOperationRunner.java:59)
at org.gradle.internal.operations.DefaultBuildOperationRunner.call(DefaultBuildOperationRunner.java:53)
at org.gradle.internal.operations.DefaultBuildOperationExecutor.call(DefaultBuildOperationExecutor.java:73)
at org.gradle.api.internal.tasks.execution.EventFiringTaskExecuter.execute(EventFiringTaskExecuter.java:52)
at org.gradle.execution.plan.LocalTaskNodeExecutor.execute(LocalTaskNodeExecutor.java:42)
at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:338)
at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$InvokeNodeExecutorsAction.execute(DefaultTaskExecutionGraph.java:325)
at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:318)
at org.gradle.execution.taskgraph.DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction.execute(DefaultTaskExecutionGraph.java:304)
at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.execute(DefaultPlanExecutor.java:463)
at org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker.run(DefaultPlanExecutor.java:380)
at org.gradle.internal.concurrent.ExecutorPolicy$CatchAndRecordFailures.onExecute(ExecutorPolicy.java:64)
at org.gradle.internal.concurrent.ManagedExecutorImpl$1.run(ManagedExecutorImpl.java:49)
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Member 16085274 wrote: these java files not the part of the code, it is part of used jars
Then either there's a bug in the libraries you're using, or you're using them wrong.
Either way, there's still nothing we can do to help you. You need to contact the library authors for support.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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> Run with --info or --debug option to get more log output.
> Run with --scan to get full insights.
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What is the difference between a static and an instance variable in Java?
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I want to make it so that when the user launches the app, it will display the GUI but at the same time it will launch other threads (multithreading) that will do some calculations and when those are finished they will update some GUI elements (which are always created before the thread with calculations is launched, that is not a problem of getting null), also when a button is pressed same as before using multithreading it will do some calculation and update the GUI after each thread is done.
Now the problem I have is that if you are using Thread(new Runnable)/start(); to launch multiple threads (even one) you get into the error Not on FX application thread. As possible solutions I read about JavaFX Task and Service but those were freezing the GUI thread until they were done.
This is what I tried ("Functions.functionX" is the placeholder, the real function takes between 0-20 seconds to finish):
button.setOnAction(event -> {
Service<Void> doSomething = new Service<Void>() {
@Override
protected Task<Void> createTask() {
Functions.functionX("parameter");
return null;
}
};
doSomething.start();
});
Now the problem with this is like I said, when the button is pressed, the GUI is unusable until the function finishes. Using straight Task had the same effect unfortunately.
What do I need to change/add to make it so that I can launch multiple threads at a time, and inside them to change elements from GUI (right now I only want to update some Labels with .setText() inside those threads, each thread updates one Label)?
modified 21-Jul-23 13:02pm.
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Where do you get the "Not on FX application thread" error? When trying to launch all those threads or when you try to update the GUI from within one of those threads? If it's the former, I can't help. If it's the latter, you simply need to run your update code on the UI thread. I don't use JavaFX but in my Java / Android, this works fine.
Thread worker = new Thread (new Runnable ()
{
@Override public void run ()
{
activity.runOnUiThread (new Runnable ()
{
@Override public void run ()
{
}
});
}
});
worker.start ();
Be wary of strong drink. It can make you shoot at tax collectors - and miss.
Lazarus Long, "Time Enough For Love" by Robert A. Heinlein
modified 21-Jul-23 15:11pm.
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I get the error when I call .setText(). Everything related to the GUI must run on FX thread, but if you are running something intensive on that, then the interface will freeze, that is why you should run that on a different thread and make the updates later.
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And that is exactly what my code does. It creates the thread worker from the UI thread and starts it. It then exits that UI function, effectively releasing the UI thread. Meanwhile, worker is executing its Run method separately from the UI. After it finishes doing stuff, worker then creates and runs a UI thread that updates the UI. JavaFX may have a different method to call instead of runOnUiThread, but the logic is the same. JavaFX has to have an equivalent.
Don't be confused by the code appearing to all be in the initial UI function. Each of those Run methods is a chunk of code that executes in a separate and distinct thread.
One caveat -- when running on Android, I have found that this doesn't always work to release the UI when it is done from within view creation / fragment startup. I don't know if JavaFX has the same issue. What I've shown works when launched from the UI once the screen is up and established; for example, from a menu item click handler.
Be wary of strong drink. It can make you shoot at tax collectors - and miss.
Lazarus Long, "Time Enough For Love" by Robert A. Heinlein
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I managed to make it work but not with Task or Service. On button action I created a new Thread thread = new Thread(new Runnable() {...});, and after I was done with the calculation, still inside thread run function I called:
Platform.runLater(new Runnable() {
@Override
public void run() {
label.setText(newValue);
}
});
I am still interested what I should do to make it work with those too, if someone can explain what I was doing wrong.
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I am complete fresher at Java. Could You help me with https:
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Asking the same question will not change the answers.
No, we're not doing your work for you, and you haven't described a problem you're having.
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I am complete fresher at Java. Could You help me with https:
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No, nobody here is going to help you cheat on a test.
If you can't answer the questions after taking the course, then go back and review the course again. If you still can't answer the questions, then find a better course.
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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My solution:
public class Exercise {
double a = 234.89;
double b = 789.456;
double c = 567.89;
double d = 78.345;
double e = System.out.println(((a+b) * (c-d)) / (a/d));
double f = System.out.println(((a*b) + (c/d)) - (a-d));
if(e>f):
println(e);
else:
println(f);
}
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Your solution to what? Can you describe your problem? and no, I'm not going to follow a link.
"the debugger doesn't tell me anything because this code compiles just fine" - random QA comment
"Facebook is where you tell lies to your friends. Twitter is where you tell the truth to strangers." - chriselst
"I don't drink any more... then again, I don't drink any less." - Mike Mullikins uncle
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public class Exercise {
double a = 234.89;
double b = 789.456;
double c = 567.89;
double d = 78.345;
double e = System.out.println(((a+b) * (c-d)) / (a/d));
double f = System.out.println(((a*b) + (c/d)) - (a-d));
if(e>f):
println(e);
else:
println(f);
}
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And what happens when you run this code?
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