Error during task 'extractDebugAnnotations'

I’m receiving the following error during our gradle ‘assembleDebug’ task, when it gets to ‘extractDebugAnnotations’

OpenTreeMap/src/org/azavea/otm/data/PendingEditDescription.java:45: '<>' operator is not allowed for source level below 1.7

The file is sometimes different, but it always has to do with a Java-6 incompatability, even though we have the source and target level set to 1.8.

Our gradle configurations are as follows: Top level:

// Top-level build file where you can add configuration options common to all sub-projects/modules.
buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:0.12.+'
        classpath 'me.tatarka:gradle-retrolambda:2.1.+'
    }
}

allprojects {
    repositories {
        mavenCentral()
    }
}

Main project:

apply plugin: 'com.android.application'

dependencies {
    compile project(':OpenTreeMap')
}

android {
    compileSdkVersion 19
    buildToolsVersion "20.0.0"

    sourceSets {
        main {
            manifest.srcFile 'AndroidManifest.xml'
            java.srcDirs = ['src']
            resources.srcDirs = ['src']
            aidl.srcDirs = ['src']
            renderscript.srcDirs = ['src']
            res.srcDirs = ['res']
            assets.srcDirs = ['assets']
        }

        // Move the tests to tests/java, tests/res, etc...
        instrumentTest.setRoot('tests')

        // Move the build types to build-types/<type>
        // For instance, build-types/debug/java, build-types/debug/AndroidManifest.xml, ...
        // This moves them out of them default location under src/<type>/... which would
        // conflict with src/ being used by the main source set.
        // Adding new build types or product flavors should be accompanied
        // by a similar customization.
        debug.setRoot('build-types/debug')
        release.setRoot('build-types/release')
    }
}

Library project (Where the majority of our code/resources live):

apply plugin: 'com.android.library'
apply plugin: 'retrolambda'

dependencies {
    compile fileTree(dir: 'libs', include: '*.jar')
    compile 'com.google.android.gms:play-services:5.0.+'
    compile 'com.android.support:appcompat-v7:20.+'
    compile 'org.jdeferred:jdeferred-android-aar:1.2.1'
    compile 'com.google.guava:guava:17.0'
}

android {
    compileSdkVersion 19
    buildToolsVersion "20.0.0"

    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }

    sourceSets {
        main {
            manifest.srcFile 'AndroidManifest.xml'
            java.srcDirs = ['src']
            resources.srcDirs = ['src']
            aidl.srcDirs = ['src']
            renderscript.srcDirs = ['src']
            res.srcDirs = ['res']
            assets.srcDirs = ['assets']
        }

        // Move the tests to tests/java, tests/res, etc...
        instrumentTest.setRoot('tests')

        // Move the build types to build-types/<type>
        // For instance, build-types/debug/java, build-types/debug/AndroidManifest.xml, ...
        // This moves them out of them default location under src/<type>/... which would
        // conflict with src/ being used by the main source set.
        // Adding new build types or product flavors should be accompanied
        // by a similar customization.
        debug.setRoot('build-types/debug')
        release.setRoot('build-types/release')
    }
}

Is there something I’m doing wrong?

[tianzhijiexian]

add apply plugin: ‘me.tatarka.retrolambda’ to all your module

[hamberluo]

@evant i am using gradle-retrolambda in a library project. how to solve that issue? app seems work well with doing nothing.