Hi
I need to add some code in ViewGroup.java and/or ViewRootImpl.java. I already 
had the sources compiled so I only recompiled the last chages I made with 
the command make framework. But when I run the emulator I receive this 
error:



--------- beginning of crash
01-29 22:22:30.570   280   280 E AndroidRuntime: *** FATAL EXCEPTION IN 
SYSTEM PROCESS: main
01-29 22:22:30.570   280   280 E AndroidRuntime: java.lang.RuntimeException: 
Missing class when invoking static main com.android.server.SystemServer
01-29 22:22:30.570   280   280 E AndroidRuntime:    at com.android.internal.
os.RuntimeInit.invokeStaticMain(RuntimeInit.java:205)
01-29 22:22:30.570   280   280 E AndroidRuntime:    at com.android.internal.
os.RuntimeInit.applicationInit(RuntimeInit.java:326)
01-29 22:22:30.570   280   280 E AndroidRuntime:    at com.android.internal.
os.RuntimeInit.zygoteInit(RuntimeInit.java:278)
01-29 22:22:30.570   280   280 E AndroidRuntime:    at com.android.internal.
os.ZygoteInit.handleSystemServerProcess(ZygoteInit.java:458)
01-29 22:22:30.570   280   280 E AndroidRuntime:    at com.android.internal.
os.ZygoteInit.startSystemServer(ZygoteInit.java:545)
01-29 22:22:30.570   280   280 E AndroidRuntime:    at com.android.internal.
os.ZygoteInit.main(ZygoteInit.java:608)
01-29 22:22:30.570   280   280 E AndroidRuntime: Caused by: java.lang.
ClassNotFoundException: com.android.server.SystemServer
01-29 22:22:30.570   280   280 E AndroidRuntime:    at java.lang.Class.
classForName(Native Method)
01-29 22:22:30.570   280   280 E AndroidRuntime:    at java.lang.Class.
forName(Class.java:324)
01-29 22:22:30.570   280   280 E AndroidRuntime:    at com.android.internal.
os.RuntimeInit.invokeStaticMain(RuntimeInit.java:203)
01-29 22:22:30.570   280   280 E AndroidRuntime:    ... 5 more
01-29 22:22:30.570   280   280 E AndroidRuntime: Caused by: java.lang.
ClassNotFoundException: Didn't find class "com.android.server.SystemServer" 
on path: DexPathList[[zip file "/system/framework/services.jar", zip file 
"/system/framework/ethernet-service.jar", zip file 
"/system/framework/wifi-service.jar"],nativeLibraryDirectories=[/vendor/lib, 
/system/lib]]
01-29 22:22:30.570   280   280 E AndroidRuntime:    at 
dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:56)
01-29 22:22:30.570   280   280 E AndroidRuntime:    at 
java.lang.ClassLoader.loadClass(ClassLoader.java:511)
01-29 22:22:30.570   280   280 E AndroidRuntime:    at 
java.lang.ClassLoader.loadClass(ClassLoader.java:469)
01-29 22:22:30.570   280   280 E AndroidRuntime:    ... 8 more
01-29 22:22:30.570   280   280 E AndroidRuntime:    Suppressed: 
java.io.IOException: No original dex files found for dex location 
/system/framework/services.jar
01-29 22:22:30.570   280   280 E AndroidRuntime:        at 
dalvik.system.DexFile.openDexFileNative(Native Method)
01-29 22:22:30.570   280   280 E AndroidRuntime:        at 
dalvik.system.DexFile.openDexFile(DexFile.java:295)
01-29 22:22:30.570   280   280 E AndroidRuntime:        at 
dalvik.system.DexFile.<init>(DexFile.java:80)
01-29 22:22:30.570   280   280 E AndroidRuntime:        at 
dalvik.system.DexFile.<init>(DexFile.java:59)
01-29 22:22:30.570   280   280 E AndroidRuntime:        at 
dalvik.system.DexPathList.loadDexFile(DexPathList.java:279)
01-29 22:22:30.570   280   280 E AndroidRuntime:        at 
dalvik.system.DexPathList.makePathElements(DexPathList.java:248)
01-29 22:22:30.570   280   280 E AndroidRuntime:        at 
dalvik.system.DexPathList.<init>(DexPathList.java:120)
01-29 22:22:30.570   280   280 E AndroidRuntime:        at 
dalvik.system.BaseDexClassLoader.<init>(BaseDexClassLoader.java:48)
01-29 22:22:30.570   280   280 E AndroidRuntime:        at 
dalvik.system.PathClassLoader.<init>(PathClassLoader.java:38)
01-29 22:22:30.570   280   280 E AndroidRuntime:        at 
com.android.internal.os.ZygoteInit.handleSystemServerProcess(ZygoteInit.java:451)

Does this means that I can't change these files?

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