Unable to instantiate applicatio

问题如下：

   Process: com.**.**, PID: 8577
    java.lang.RuntimeException: Unable to instantiate application com.**.**.App: java.lang.ClassNotFoundException: Didn't find class "com.**.**.App" on path: DexPathList[[zip file "/data/app/com.**.**-mSd-EcF526nxH8WEFWBAWQ==/base.apk"],nativeLibraryDirectories=[/data/app/com.**.alarm-mSd-EcF526nxH8WEFWBAWQ==/lib/x86, /system/lib, /vendor/lib]]
        at android.app.LoadedApk.makeApplication(LoadedApk.java:971)
        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5765)
        at android.app.ActivityThread.-wrap1(Unknown Source:0)
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1661)
        at android.os.Handler.dispatchMessage(Handler.java:105)
        at android.os.Looper.loop(Looper.java:164)
        at android.app.ActivityThread.main(ActivityThread.java:6541)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767)
     Caused by: java.lang.ClassNotFoundException: Didn't find class "com.**.alarm.App" on path: DexPathList[[zip file "/data/app/com.**.alarm-mSd-EcF526nxH8WEFWBAWQ==/base.apk"],nativeLibraryDirectories=[/data/app/com.**.alarm-mSd-EcF526nxH8WEFWBAWQ==/lib/x86, /system/lib, /vendor/lib]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:93)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
        at android.app.Instrumentation.newApplication(Instrumentation.java:1086)
        at android.app.LoadedApk.makeApplication(LoadedApk.java:965)
        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5765) 
        at android.app.ActivityThread.-wrap1(Unknown Source:0) 
        at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1661) 
        at android.os.Handler.dispatchMessage(Handler.java:105) 
        at android.os.Looper.loop(Looper.java:164) 
        at android.app.ActivityThread.main(ActivityThread.java:6541) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.Zygote$MethodAndArgsCaller.run(Zygote.java:240) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:767) 
        Suppressed: java.io.IOException: Failed to open dex files from /data/app/com.**.alarm-mSd-EcF526nxH8WEFWBAWQ==/base.apk because: Failure to verify dex file '/data/app/com.**.**-mSd-EcF526nxH8WEFWBAWQ==/base.apk': Bad method handle type 7
        at dalvik.system.DexFile.openDexFileNative(Native Method)
        at dalvik.system.DexFile.openDexFile(DexFile.java:353)
        at dalvik.system.DexFile.<init>(DexFile.java:100)
        at dalvik.system.DexFile.<init>(DexFile.java:74)
        at dalvik.system.DexPathList.loadDexFile(DexPathList.java:374)
        at dalvik.system.DexPathList.makeDexElements(DexPathList.java:337)
        at dalvik.system.DexPathList.<init>(DexPathList.java:157)
        at dalvik.system.BaseDexClassLoader.<init>(BaseDexClassLoader.java:65)
        at dalvik.system.PathClassLoader.<init>(PathClassLoader.java:64)
        at com.android.internal.os.PathClassLoaderFactory.createClassLoader(PathClassLoaderFactory.java:43)
        at android.app.ApplicationLoaders.getClassLoader(ApplicationLoaders.java:69)
        at android.app.ApplicationLoaders.getClassLoader(ApplicationLoaders.java:36)
        at android.app.LoadedApk.createOrUpdateClassLoaderLocked(LoadedApk.java:676)
        at android.app.LoadedApk.getClassLoader(LoadedApk.java:709)
        at android.app.LoadedApk.getResources(LoadedApk.java:936)
        at android.app.ContextImpl.createAppContext(ContextImpl.java:2242)
        at android.app.ActivityThread.handleBindApplication(ActivityThread.java:5672)
                ... 8 more

解决方案如下：
app.grade android 标签下
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}