cptaffe commented on a change in pull request #1751: MAPREDUCE-7251: Present
friendlier error for non-static main
URL: https://github.com/apache/hadoop/pull/1751#discussion_r356249967
##########
File path:
hadoop-common-project/hadoop-common/src/main/java/org/apache/hadoop/util/RunJar.java
##########
@@ -315,6 +316,11 @@ public void run() {
Thread.currentThread().setContextClassLoader(loader);
Class<?> mainClass = Class.forName(mainClassName, true, loader);
Method main = mainClass.getMethod("main", String[].class);
+
+ if (!Modifier.isStatic(main.getModifiers())) {
+ throw new IOException("Method main must be static: " + mainClassName);
Review comment:
I've added a test, but I couldn't get Hadoop to run locally—seeing this
error:
```
Plugin org.apache.hadoop:hadoop-maven-plugins:3.3.0-SNAPSHOT or one of its
dependencies could not be resolved: Could not find artifact
org.apache.hadoop:hadoop-maven-plugins:jar:3.3.0-SNAPSHOT
```
Guidance from the [Dev Environment
Setup](https://cwiki.apache.org/confluence/display/HADOOP/How+To+Contribute#HowToContribute-DevEnvironmentSetup)
was no help unfortunately. The suggested docker script also fails to build.
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