Still requires Java 8

[CptSpaceToaster]

I think I have everything setup properly, but I'm getting an odd error that seems to relate to mismatched JVM versions:

Build.gradle

plugins {
    id 'com.stehno.natives' version '0.2.1'
}
apply plugin: 'java'
apply plugin: 'application'

mainClassName = "OpenGLTest"

sourceCompatibility = 1.7
version = '1.0.0'

repositories {
    mavenCentral()
}

dependencies {
    compile group: 'org.codehaus.jackson', name: 'jackson-core-asl', version: '1.9.13'
    compile group: 'org.codehaus.jackson', name: 'jackson-mapper-asl', version: '1.9.13'
    compile group: 'org.lwjgl.lwjgl', name: 'lwjgl', version: '2.+'
    //testCompile group: 'junit', name: 'junit', version: '4.11'
}

task wrapper(type: Wrapper) {
    gradleVersion = '2.3'
}

This is what happens in my console

toaster@toaster ~/Github/Lightscreen (master *+)$ java -version
java version "1.7.0_75"
OpenJDK Runtime Environment (IcedTea 2.5.4) (7u75-2.5.4-1~precise1)
OpenJDK 64-Bit Server VM (build 24.75-b04, mixed mode)
toaster@toaster ~/Github/Lightscreen (master *+)$ 
toaster@toaster ~/Github/Lightscreen (master *+)$ gradle --version

------------------------------------------------------------
Gradle 2.3
------------------------------------------------------------

Build time:   2015-02-16 05:09:33 UTC
Build number: none
Revision:     586be72bf6e3df1ee7676d1f2a3afd9157341274

Groovy:       2.3.9
Ant:          Apache Ant(TM) version 1.9.3 compiled on December 23 2013
JVM:          1.7.0_75 (Oracle Corporation 24.75-b04)
OS:           Linux 3.18.1 amd64

toaster@toaster ~/Github/Lightscreen (master *+)$ 
toaster@toaster ~/Github/Lightscreen (master *+)$ gradle --refresh-dependencies

FAILURE: Build failed with an exception.

* What went wrong:
java.lang.UnsupportedClassVersionError: com/stehno/gradle/natives/NativesPlugin : Unsupported major.minor version 52.0
> com/stehno/gradle/natives/NativesPlugin : Unsupported major.minor version 52.0

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

BUILD FAILED

Total time: 5.661 secs

Full stacktrace: https://gist.github.com/CptSpaceToaster/003d66f6f2cc807eb2f2

Any idea what I'm doing wrong?

[CptSpaceToaster]

This might be an issue with Gradle forcing J8, looking into this...

Edit: Yup... Gradle is forcing J8 here.... what a bummer.

Is there another method other than using the pluggins block or downloading and compiling it myself? I suppose I could stash a copy in my git repo, but I'm trying to allow my project to be compiled everywhere on J7, without having too many extra steps in setup.

Edit: Edit: I opened a report on Gradle's Forum: http://discuss.gradle.org/t/gradle-plugins-block-does-not-function-using-java-7/8595

Sorry for the chatter.

[CptSpaceToaster]

Hmmm... sorry for all of the github chatter, but this was my problem: https://github.com/cjstehno/gradle-natives/issues/8

[cjstehno]

No problem. Should this issue be closed or are you still having issues?

[CptSpaceToaster]

Long story short:

1. I ran into problems, and thought that you had fixed them in issue 8.
2. I blamed gradle
3. gradle is fine
4. Your pluggin still requires J8

[cjstehno]

Gotcha. I will have to dig deeper into it to see what's still using J8. I should be able to look at it this week.

[CptSpaceToaster]

So... when I was trying to get this to work, I just circumvented the pluggin with these two code blocks in my build.gradle:

String os = System.properties['os.name'].toLowerCase()
if (project.hasProperty('os')) {
    os = project.os.toLowerCase()
} else {
    if (os.contains("windows"))
        os = "windows"
    if (os.contains("linux"))
        os = "linux"
    if (os.contains("os x"))
        os = "osx"
}

and

// Add a task to copy the native libraries to the $buildDir/natives/$os directory
task ('installNatives', type: Copy) {
    def artifacts = configurations.compile.resolvedConfiguration.resolvedArtifacts.findAll { it.classifier == "natives-$os" }
    artifacts.each {
        from zipTree(it.file)
    }
    into "$buildDir/natives/$os"
}

// Add the natives lib to the java.library.path for testing
run {
    systemProperty "java.library.path", "$buildDir/natives/$os"
}

run.dependsOn 'installNatives'

I asked gradle where it hid the natives, and then did some OS fuzzing to detect what I'm running on, and where I should copy too. You can override the os using the flag -Pos="linux"

https://github.com/CptSpaceToaster/OpenGL-boiler/blob/master/build.gradle

Thoughts? I think this pluggin might be improved by looking at System.properties['os.name'].toLowerCase()

[cjstehno]

I will look into your suggestions, might make a good default value. Also, I think I have a fix for the Java 8 requirement. I fixed a similar issue at work today which basically comes down to replacing:

compileJava {
    sourceCompatibility = 7
    targetCompatibility = 7
}

with

sourceCompatibility = 7
targetCompatibility = 7

I should be able to test this in the next day or two.

[cjstehno]

@CptSpaceToaster - Please install v0.2.2 when you have a chance and let me know if you continue to have issues. The .class files are reading as 7 now so this should be fixed. The new version is deployed to bintray, but not appearing on the Gradle plugins site yet so you might need to verify the version.

[CptSpaceToaster]

Works!