无法制作带有.jar编译的android项目

Question

Really looked all over the place, but I'm at pretty much a deadlock. I'm currently unable to compile any Android Project that uses an external .jar. Even if this is just an empty project it always returns the same error:

Error:Execution failed for task ':app:preDexDebug'.

com.android.ide.common.process.ProcessException: org.gradle.process.internal.ExecException: Process 'command 'D:\\Program Files\\Java\\jdk1.8.0_60\\bin\\java.exe'' finished with non-zero exit value 1.

Am I completely missing something? Are native-java (Netbeans) jars incompatible for Android?

Currently the process is:
- copy the .jar to the libs folder
- resync gradle
- clean rebuild
- try to run
- death

Edit: For those of you who should ever run into this wall. If you have pure JAVA jars that contain pre 6.0 JDK code and compile it with a higher level JDK, Android wil not recognize it and give you that specific error. Compiling my netbeans project with JDK 5.0 fixed my problem and my Android projects finally run now.

In Netbeans, right click the libraries folder in your project > properties > sources and under Source/Binary Format, select JDK 5 (or lower). Your Android project should compile now with your jar.

Answer 1

• First of all you need to update the you sdk to the current version of Android api like Android M (Api level 23) and also download the latest version of gradle. (ie use everthing latest and utilize the hard work of android sdk developers because that's for helping the android developers and android users)
• and also use that for your app target version
• Then restart android with invalidate cache and restart option
• And then you should add .jar file to libs folder then click option
  add as library

Answer 2

Do you have this line of code in your build.gradle file?:

compile fileTree(dir: 'libs', include: ['*.jar'])

And where is your libs folder located? It should be in the root folder of the module, not the whole prject.

.
├── app
│   ├── app.iml
│   ├── build.gradle
│   ├── libs  <----- check this
│   │   ├── greendao-1.3.7.jar
│   │   ├── httpcore-4.3-beta1.jar
│   │   ├── mimecraft-1.1.1.jar
│   │   └── volley.jar
│   ├── proguard-rules.pro
│   └── src
│       ├── androidTest
│       └── main
├── android
│   ├── app
│   │   └── annotations.xml
│   └── content
│       └── annotations.xml
├── gradle
│   └── wrapper
│       ├── gradle-wrapper.jar
│       └── gradle-wrapper.properties
├── build.gradle
├── gradle.properties
├── gradlew
├── gradlew.bat
├── project-name.iml
├── local.properties
├── settings.gradle
└── settings.gradle.orig

Also, in my experience, most of the time java finished with non-zero exit code error is related to resources or other non-java related stuff. You should check out Gradle console and look for red lines, they contain actual error messages that you can check and fix.