Error while creating own jar library for Android project

Question

Currently I am working on basics of how to create a jar library in Android Studio.

I followed How to make a .jar out from an Android Studio project and how to create a jar file from android studio tutorials. And went through each step described in the first tutorial.

However when I am buildig and running this library project it is showing me following error

Error:Execution failed for task ':app:preDexDebug'. com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'C:\Program Files\Java\jdk1.8.0_60\bin\java.exe'' finished with non-zero exit value 1

I looked into this issue in SO but those questions didn't helped me at all. It is not memory issue for me because all other applications are running pretty fine. Though my project didn't compile perfectly still I got the library jar file from my library folder and when I import that jar in other project as library I got same error message.

So I think I am missing some key point here. If anybody faced similar problem or can help me out please gimme your suggestions.

If you want me to post any of my code then tell me and I will do that, Thanks.

I just add a java library module and add a very simple Multiplication class there( Check below code). Then add that library module as library in my project. Library Code

public class Multiplication {

    public double multiply(int num1, int num2){
        return num1*num2;
    }
}

Activity Code

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    edt1 = (EditText)findViewById(R.id.et1);
    edt2 = (EditText)findViewById(R.id.et2);
    btn  = (Button)findViewById(R.id.btn);
    tv = (TextView)findViewById(R.id.tvRes);

    multiplication = new Multiplication();

    btn.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {

            double res = multiplication.multiply(Integer.parseInt(edt1.getText().toString()),Integer.parseInt(edt2.getText().toString()));

            tv.setText(Double.toString(res));
        }
    });

build.gradle

apply plugin: 'com.android.application'

android {
    compileSdkVersion 22
    buildToolsVersion "22.0.1"

    defaultConfig {
        applicationId "com.example.myapplication"
        minSdkVersion 11
        targetSdkVersion 22
        versionCode 1
        versionName "1.0"
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile 'com.android.support:appcompat-v7:22.2.1'
    compile files('D:/Work_New/MyApplication/libs/mylibjar.jar')
}

Complete Error Log

Information:Gradle tasks [:app:assembleDebug]
:app:preBuild UP-TO-DATE
:app:preDebugBuild UP-TO-DATE
:app:compileDebugNdk UP-TO-DATE
:app:checkDebugManifest
:app:preReleaseBuild UP-TO-DATE
:mylibjar:compileJava UP-TO-DATE
:mylibjar:processResources UP-TO-DATE
:mylibjar:classes UP-TO-DATE
:mylibjar:jar UP-TO-DATE
:app:prepareComAndroidSupportAppcompatV72221Library UP-TO-DATE
:app:prepareComAndroidSupportSupportV42221Library UP-TO-DATE
:app:prepareDebugDependencies
:app:compileDebugAidl UP-TO-DATE
:app:compileDebugRenderscript UP-TO-DATE
:app:generateDebugBuildConfig UP-TO-DATE
:app:generateDebugAssets UP-TO-DATE
:app:mergeDebugAssets UP-TO-DATE
:app:generateDebugResValues UP-TO-DATE
:app:generateDebugResources UP-TO-DATE
:app:mergeDebugResources UP-TO-DATE
:app:processDebugManifest UP-TO-DATE
:app:processDebugResources UP-TO-DATE
:app:generateDebugSources UP-TO-DATE
:app:compileDebugJava UP-TO-DATE
:app:preDexDebug
UNEXPECTED TOP-LEVEL EXCEPTION:
com.android.dx.cf.iface.ParseException: bad class file magic (cafebabe) or version (0034.0000)
    at com.android.dx.cf.direct.DirectClassFile.parse0(DirectClassFile.java:472)
    at com.android.dx.cf.direct.DirectClassFile.parse(DirectClassFile.java:406)
    at com.android.dx.cf.direct.DirectClassFile.parseToInterfacesIfNecessary(DirectClassFile.java:388)
    at com.android.dx.cf.direct.DirectClassFile.getMagic(DirectClassFile.java:251)
    at com.android.dx.command.dexer.Main.processClass(Main.java:704)
    at com.android.dx.command.dexer.Main.processFileBytes(Main.java:673)
    at com.android.dx.command.dexer.Main.access$300(Main.java:83)
    at com.android.dx.command.dexer.Main$1.processFileBytes(Main.java:602)
    at com.android.dx.cf.direct.ClassPathOpener.processArchive(ClassPathOpener.java:284)
    at com.android.dx.cf.direct.ClassPathOpener.processOne(ClassPathOpener.java:166)
    at com.android.dx.cf.direct.ClassPathOpener.process(ClassPathOpener.java:144)
    at com.android.dx.command.dexer.Main.processOne(Main.java:632)
    at com.android.dx.command.dexer.Main.processAllFiles(Main.java:510)
    at com.android.dx.command.dexer.Main.runMonoDex(Main.java:280)
    at com.android.dx.command.dexer.Main.run(Main.java:246)
    at com.android.dx.command.dexer.Main.main(Main.java:215)
    at com.android.dx.command.Main.main(Main.java:106)
...while parsing com/MultiplicationTest/Multiplication.class
1 error; aborting
Error:Execution failed for task ':app:preDexDebug'.
> com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'C:\Program Files\Java\jdk1.8.0_60\bin\java.exe'' finished with non-zero exit value 1

Though it not showing any error when I am compiling my project it showing me the above error I mentioned.

@Heyyou Check my edited post. Basically it is like a test library project. — Kunu, Sep 05 '15 at 11:04
You cannot create .jar libraries for "Android" in "Android studio", only java libraries you can create. For android, you need to create .aar libraries. — N Kaushik, Sep 11 '15 at 11:11
I think some useful info should be in log before "Error:Execution failed for task ':app:preDexDebug'...". Can you check it and post? — Ilya Tretyakov, Sep 14 '15 at 06:48

Ilya Tretyakov · Accepted Answer · 2015-09-14T07:55:52.483

5

Update 2

According to logs you build your *.jar with Java 1.8. The max version of java that Android supports is 1.7. So you have to set source code compatability to 1.7 and rebuild the jar-file.

If you are building this jar not from gradle (or Android Studio) you need to change your JDK version (File -> Project Structure -> SDK Location -> JDK Location).

For gradle module see "Update 1"

Update 1

For you java module (from which you are trying to get jar) put these lines:

apply plugin: 'java'
sourceCompatibility = 1.7
targetCompatibility = 1.7

Try to put next code to your gradle files for Android modules:

android {
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_7
        targetCompatibility JavaVersion.VERSION_1_7
    }
}

edited Sep 14 '15 at 07:55

answered Sep 10 '15 at 11:30

Ilya Tretyakov

6,848
3
28
45

I will try it and let you know. – Kunu Sep 10 '15 at 13:10
Where you want me to put those code. Because in my java module I don't have any build.gradle file or any setting file where I can use `apply plugin: 'java'` – Kunu Sep 14 '15 at 06:59
1

You did your *.jar with Java 1.8. The max version of java that Android support is 1.7. So you have to set source code compatability to 1.7. If you are building this jar not from gradle (or Android Studio) you have to change settings (File -> Project Structure -> SDK Location -> JDK Location). Check that you are using 1.7 everythere – Ilya Tretyakov Sep 14 '15 at 07:06
Yes you are spot on. I changed my jdk location to Java 1.7 and problem solved. Edit your answer so that I can accept it. If there is a way to achieve this using jdk 1.8 then please post it as answer also. – Kunu Sep 14 '15 at 07:51

N Kaushik · Answer 2 · 2015-09-12T09:31:10.057

Reason for "non-zero exit value 1" error may be different.

1.Delete the library and next rebuild the project to check if it is working or not.

2.If it is working fine remove compile filetree option from the dependencies and rebuild it again

dependencies {
compile 'com.android.support:appcompat-v7:22.2.1'
compile files('D:/Work_New/MyApplication/libs/mylibjar.jar')
}

If this problem is still there, create one simple project and import the jar library first to this project. Next add these other dependencies one by one to find out the problem.If the problem is not occuring again, copy all java files to this new project. Next copy "image" files one after another. Often drawable image files causes this problem "non-zero exit value 1"

Edit: Also add this inside android{ of your dependency:

dexOptions {
    preDexLibraries = true
}

I didn't got you properly. If I delete my library then how can I access its methods. — Kunu, Sep 14 '15 at 06:42
Sorry, I mean to say that create one new project with same package name and add all these libraries.(without any codes) . Next if the problem is still there , remove libraries one after another. — N Kaushik, Sep 14 '15 at 06:58

Malte · Answer 3 · 2015-09-03T10:59:09.227

0

In android you cannot use .jar-files as libraries from other android-projects. you have to import the android-project as a library and set the project to a lib-project. You have to import the android-lib-project into each other android-project you are using it in.

Thats how it is in eclipse, i guess in Android Studio it is a similar approach

edited Sep 03 '15 at 10:59

answered Sep 03 '15 at 10:49

Malte

589
5
24

I am not sure what you talking about, because while I was using eclipse I have used jar files as library as well as library project. And in Android Studio we add jar files as library and compile them. – Kunu Sep 03 '15 at 10:54
it sounds like you want to use an android-project as library? Or are you talking about a simple Java-Project? – Malte Sep 03 '15 at 10:58
If you go through my question you can see in those example that I need to create a Android project then java library as a module. Then I need to extract jar of that java library module. So yes it is an Android project with a java library as a module. – Kunu Sep 03 '15 at 11:03

score 0 · Answer 4 · answered Sep 11 '15 at 13:23

I assume you have currently two projects in your workspace: 1) Android app project (marked in gradle file as "apply plugin: 'com.android.application'") 2) java library project ("apply plugin: 'java'") and they are both linked via the settings.gradle file.

You should be able to build the java project via 'assemble' which then outputs a .jar file in the build/libs folder (this can also be done via the 'jar' command of Gradle).

Maybe you can post a screenshot of your tree structure in Android Studio for some more help.

score 0 · Answer 5 · answered Sep 11 '15 at 14:38

0

Try to import your module (a java library) like this:

compile project(':MyLib');  // MyLib is a name of your module

answered Sep 11 '15 at 14:38

naXa stands with Ukraine

35,493
19
190
259

yeah I already tried that. Previously I import my library module like that but it didn't worked so I was experimenting. – Kunu Sep 11 '15 at 14:43
Actually this is java library so it didn't asked for any extra gradle script. In new android module it creates extra gradle file I guess. If I am missing something then you can guide me here. – Kunu Sep 11 '15 at 14:50

yovi · Answer 6 · 2015-11-24T14:45:49.900

I also got the same error while building my android solution (has couple of java modules) with Java 1.8 SDK. finally I have fixed it with Gradle Retrolamdba Plugin

Add the below classpath to the build.gradle file in the root project

classpath 'me.tatarka:gradle-retrolambda:3.2.4'

And the retrolamdba plug to the build.gradle located in the sub project/java module (jar library)

apply plugin: 'java'
apply plugin: 'me.tatarka.retrolambda'

Error while creating own jar library for Android project

6 Answers6

Linked