[jira] [Created] (BEAM-10661) Java quickstart using Gradle doesn't work

["Marcus Truscello (Jira)" <ji...@apache.org>]

Marcus Truscello created BEAM-10661:
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             Summary: Java quickstart using Gradle doesn't work
                 Key: BEAM-10661
                 URL: https://issues.apache.org/jira/browse/BEAM-10661
             Project: Beam
          Issue Type: Bug
          Components: website
            Reporter: Marcus Truscello


As written, the Java quickstart using Gradle doesn't work.  The issue is that the {{execute}} task created in step 2 makes it so that the {{exec.args}} define is required for every task (including build!), otherwise a NullPointerException is thrown.

 

Example output:

 
{code:java}
~/word-count-beam$ gradle build


FAILURE: Build failed with an exception.


* Where:
Build file '/Users/username/word-count-beam/build.gradle' line: 56


* What went wrong:
A problem occurred evaluating root project 'word-count-beam'.
> java.lang.NullPointerException (no error message)


* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.


* Get more help at https://help.gradle.org


BUILD FAILED in 582ms
{code}
 

Where line 56 of my build.gradle file is the split command in the execute task:
{code:java}
    52	task execute (type:JavaExec) {
    53	        main = System.getProperty("mainClass")
    54	        classpath = sourceSets.main.runtimeClasspath
    55	        systemProperties System.getProperties()
    56	        args System.getProperty("exec.args").split()
    57	}
{code}
 

Running with an empty exec.args fixes the issue:
{code:java}
~/word-count-beam$ gradle build -Dexec.args=""


Deprecated Gradle features were used in this build, making it incompatible with Gradle 7.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/6.5.1/userguide/command_line_interface.html#sec:command_line_warnings


BUILD SUCCESSFUL in 782ms
4 actionable tasks: 4 up-to-date
{code}



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