I need to use Java 6 but NetBeans is not using it even after all the configurations I made. It keeps running Maven with the Default that is Java 8 for my IDE. The same configuration runs well on Eclipse so I don't get what I am doing wrong.
I don't want to define the compiler in the nb-configuration.xml since I would have to commit the file. I would expect NetBeans to get it right from the POM.
General information:
- I am using NetBeans 8.0.1 (fully updated) running on Java 8
- NetBeans 8 needs JDK 7+ in order to work
- Using Maven 3.2.3, but the embedded (Maven 3.0.5 didn't work as well)
- All Maven plugins are up to date
To reproduce simply create a Maven project of any type in NetBeans. In my case I tried with Java, Web and EJB but none worked.
The following image shows that the JDK is properly added to the IDE.
Tools > Java Platforms
JDK 1.6 is added.
POM configurations that I have tried:
Properties
<properties>
<maven.compiler.source>1.6</maven.compiler.source>
<maven.compiler.target>1.6</maven.compiler.target>
</properties>
Compiler Plugin
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.2</version>
<configuration>
<source>1.6</source>
<target>1.6</target>
</configuration>
</plugin>
Enforcer Plugin
Enforcing Java 6 gives the following error:
Detected JDK Version: 1.8.0-25 is not in the allowed range [1.6,1.7).
------------------------------------------------------------------------
BUILD FAILURE
Configuration for the enforcer:
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-enforcer-plugin</artifactId>
<version>1.3.1</version>
<executions>
<execution>
<id>enforce-versions</id>
<goals>
<goal>enforce</goal>
</goals>
<configuration>
<rules>
<requireJavaVersion>
<version>[1.6,1.7)</version>
</requireJavaVersion>
</rules>
</configuration>
</execution>
</executions>
</plugin>
Test code for Java 6
The following code should not compile:
import java.nio.file.Files;
import java.time.LocalTime;
public class JavaVersionChecker {
public static void main(String[] args) {
System.out.println(Files.class); // Java 7 API
System.out.println("Time: " + LocalTime.now()); // Java 8 API
// Print Java version
System.out.println(System.getProperty("java.version"));
}
}
Test Output
The test code compile with Java 7 and 8 API, but only Java 6 should be accepted.
------------------------------------------------------------------------
Building java6_project 1.0-SNAPSHOT
------------------------------------------------------------------------
--- exec-maven-plugin:1.2.1:exec (default-cli) @ java6_project ---
class java.nio.file.Files
Time: 19:24:05.997
1.8.0_25
------------------------------------------------------------------------
BUILD SUCCESS
------------------------------------------------------------------------
Total time: 0.610 s
Finished at: 2014-11-21T19:24:06-02:00
Final Memory: 6M/123M
------------------------------------------------------------------------
JDK 6 should be detected by the IDE
