sdedic opened a new pull request #2982:
URL: https://github.com/apache/netbeans/pull/2982
The following error started to appear in tests:
```
[junit] java.lang.NullPointerException
[junit] at
org.netbeans.modules.gradle.ActionProviderImpl.lambda$null$6(ActionProviderImpl.java:340)
[junit] at
org.netbeans.modules.gradle.execute.ProjectConfigurationSupport.executeWithConfiguration(ProjectConfigurationSupport.java:96)
[junit] at
org.netbeans.modules.gradle.ActionProviderImpl.lambda$invokeProjectAction2$7(ActionProviderImpl.java:326)
[junit] at org.openide.util.Task.notifyFinished(Task.java:215)
[junit] at
org.netbeans.modules.gradle.execute.GradleDaemonExecutor$GradleTask.finish(GradleDaemonExecutor.java:419)
[junit] at
org.netbeans.modules.gradle.execute.GradleDaemonExecutor.run(GradleDaemonExecutor.java:246)
[junit] at org.openide.util.Task.run(Task.java:232)
```
This is caused by `Trivial` implementation of ExecutionEngine did not
initialize `io` field at all in its constructor...
Then during debugging, I've hid a deadlock:
```
"DisconnectableInputStream source reader" #30 daemon prio=1 os_prio=0
tid=0x00007f59652fc800 nid=0x5702 runnable [0x00007f59fc2c5000]
java.lang.Thread.State: RUNNABLE
at java.io.FileInputStream.readBytes(Native Method)
at java.io.FileInputStream.read(FileInputStream.java:255)
at java.io.BufferedInputStream.read1(BufferedInputStream.java:284)
at java.io.BufferedInputStream.read(BufferedInputStream.java:345)
- locked <0x00000000e250a700> (a java.io.BufferedInputStream)
at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:284)
at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:326)
at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:178)
- locked <0x00000000fec2cb48> (a java.io.InputStreamReader)
at java.io.InputStreamReader.read(InputStreamReader.java:184)
at java.io.BufferedReader.fill(BufferedReader.java:161)
at java.io.BufferedReader.read(BufferedReader.java:182)
- locked <0x00000000fec2cb48> (a java.io.InputStreamReader)
<--- locked because of read in progress
at org.openide.util.io.ReaderInputStream.read(ReaderInputStream.java:65)
at org.openide.util.io.ReaderInputStream.read(ReaderInputStream.java:88)
at
org.gradle.util.DisconnectableInputStream$1.run(DisconnectableInputStream.java:98)
at java.lang.Thread.run(Thread.java:748)
"Default RequestProcessor" #22 daemon prio=1 os_prio=0
tid=0x00007f5a18b8d800 nid=0x56f1 waiting for monitor entry [0x00007f59fc6c7000]
java.lang.Thread.State: BLOCKED (on object monitor)
at java.io.BufferedReader.close(BufferedReader.java:522)
- waiting to lock <0x00000000fec2cb48> (a java.io.InputStreamReader)
<---- deadlocks on close from other thread.
at
org.openide.util.io.ReaderInputStream.close(ReaderInputStream.java:130)
at
org.netbeans.modules.gradle.execute.GradleDaemonExecutor.closeInOutErr(GradleDaemonExecutor.java:348)
- locked <0x00000000fec28190> (a
org.netbeans.modules.gradle.execute.GradleDaemonExecutor)
at
org.netbeans.modules.gradle.execute.GradleDaemonExecutor.run(GradleDaemonExecutor.java:275)
at org.openide.util.Task.run(Task.java:232)
at
org.openide.execution.ExecutionEngine$Trivial$ET.lambda$run$0(ExecutionEngine.java:156)
```
Again, `IOProvider.Trivial` implementation in Platform is the culprit: if
someone starts `read()` first, then close on the `InputOuput.getIn()` stream
will deadlock: it's buffered from `System.in` that neve closes.
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