I don't know why. Thanks for your help.
Based on mips32 CPU, Linux 3.14.
D/AndroidRuntime( 323):
D/AndroidRuntime( 323): >>>>>> AndroidRuntime START com.android.internal.os.ZygoteInit <<<<<<
D/AndroidRuntime( 323): CheckJNI is ON
D/dalvikvm( 323): Trying to load lib libjavacore.so 0x0
D/dalvikvm( 323): Added shared lib libjavacore.so 0x0
D/dalvikvm( 323): Trying to load lib libnativehelper.so 0x0
D/dalvikvm( 323): Added shared lib libnativehelper.so 0x0
D/dalvikvm( 323): No JNI_OnLoad found in libnativehelper.so 0x0, skipping init
W/dalvikvm( 323): Exception Ljava/lang/NullPointerException; thrown while initializing Llibcore/icu/ICU;
W/dalvikvm( 323): Exception Ljava/lang/ExceptionInInitializerError; thrown while initializing Ljava/lang/System;
W/dalvikvm( 323): Exception Ljava/lang/ExceptionInInitializerError; thrown while initializing Ljava/lang/Enum;
W/dalvikvm( 323): Exception Ljava/lang/ExceptionInInitializerError; thrown while initializing Ljava/lang/VMThread;
E/dalvikvm( 323): thread classes failed to initialize
W/dalvikvm( 323): CreateJavaVM failed: dvmPrepMainThread failed
E/AndroidRuntime( 323): JNI_CreateJavaVM failed
D/AndroidRuntime( 324):
D/AndroidRuntime( 324): >>>>>> AndroidRuntime START com.android.internal.os.ZygoteInit <<<<<<
D/AndroidRuntime( 324): CheckJNI is ON
D/dalvikvm( 324): Trying to load lib libjavacore.so 0x0
D/dalvikvm( 324): Added shared lib libjavacore.so 0x0
D/dalvikvm( 324): Trying to load lib libnativehelper.so 0x0
D/dalvikvm( 324): Added shared lib libnativehelper.so 0x0
D/dalvikvm( 324): No JNI_OnLoad found in libnativehelper.so 0x0, skipping init
W/dalvikvm( 324): Exception Ljava/lang/NullPointerException; thrown while initializing Llibcore/icu/ICU;
W/dalvikvm( 324): Exception Ljava/lang/ExceptionInInitializerError; thrown while initializing Ljava/lang/System;
W/dalvikvm( 324): Exception Ljava/lang/ExceptionInInitializerError; thrown while initializing Ljava/lang/Enum;
W/dalvikvm( 324): Exception Ljava/lang/ExceptionInInitializerError; thrown while initializing Ljava/lang/VMThread;
E/dalvikvm( 324): thread classes failed to initialize
W/dalvikvm( 324): CreateJavaVM failed: dvmPrepMainThread failed
E/AndroidRuntime( 324): JNI_CreateJavaVM failed