I have 3 devices.
1.base on cm9(android 4.0.4).
2.htcg14(android 4.0.3)
3.moto me525 base on miui(android 2.2)
they are all rooted.
I exec the code below in the terminal on device 1 and 3,the process works fine. But device 2,it doesn't work.
su
export CLASSPATH=/sdcard/foo.jar
exec app_process /system/bin xx.xx.Test '$@'
log
W/dalvikvm(12364): Exception Ljava/lang/NullPointerException; thrown while initializing Ljava/lang/System;
W/dalvikvm(12364): Exception Ljava/lang/ExceptionInInitializerError; thrown while initializing Ljava/lang/ClassLoader$SystemClassLoader;
W/dalvikvm(12364): WARNING: system class loader is NULL (setting main ctxt)
W/dalvikvm(12364): Warning: tracked references remain post-initialization
W/dalvikvm(12364): MAIN reference table (0xf9a388) dump:
W/dalvikvm(12364): Last 1 entries (of 1):
E/dalvikvm(12364): Class lookup Ljava/lang/Daemons; attempted with exception pending
W/dalvikvm(12364): Pending exception is:
I/dalvikvm(12364): java.lang.ExceptionInInitializerError:
I/dalvikvm(12364): at java.lang.ClassLoader.getSystemClassLoader(ClassLoader.java:125)
I/dalvikvm(12364): at dalvik.system.NativeStart.main(Native Method)
I/dalvikvm(12364): Caused by:
I/dalvikvm(12364): java.lang.ExceptionInInitializerError:
I/dalvikvm(12364): at java.lang.ClassLoader.createSystemClassLoader(ClassLoader.java:100)
I/dalvikvm(12364): at java.lang.ClassLoader.access$000(ClassLoader.java:65)
I/dalvikvm(12364): at java.lang.ClassLoader$SystemClassLoader.<clinit>(ClassLoader.java:81)
I/dalvikvm(12364): at java.lang.ClassLoader.getSystemClassLoader(ClassLoader.java:125)
I/dalvikvm(12364): at dalvik.system.NativeStart.main(Native Method)
I/dalvikvm(12364): Caused by:
I/dalvikvm(12364): java.lang.NullPointerException:
I/dalvikvm(12364): at java.util.Hashtable.put(Hashtable.java:365)
I/dalvikvm(12364): at java.lang.System.initSystemProperties(System.java:286)
I/dalvikvm(12364): at java.lang.System.getProperties(System.java:260)
I/dalvikvm(12364): at java.lang.System.getProperty(System.java:425)
I/dalvikvm(12364): at java.lang.System.getProperty(System.java:406)
I/dalvikvm(12364): at java.lang.System.<clinit>(System.java:90)
I/dalvikvm(12364): at java.lang.ClassLoader.createSystemClassLoader(ClassLoader.java:100)
I/dalvikvm(12364): at java.lang.ClassLoader.access$000(ClassLoader.java:65)
I/dalvikvm(12364): at java.lang.ClassLoader$SystemClassLoader.<clinit>(ClassLoader.java:81)
I/dalvikvm(12364): at java.lang.ClassLoader.getSystemClassLoader(ClassLoader.java:125)
I/dalvikvm(12364): at dalvik.system.NativeStart.main(Native Method)
I/dalvikvm(12364): DALVIK THREADS:
I/dalvikvm(12364): (mutexes: tll=0 tsl=0 tscl=0 ghl=0)
I/dalvikvm(12364): "main" prio=5 tid=1 RUNNABLE
I/dalvikvm(12364): | group="main" sCount=0 dsCount=0 obj=0x40aa1490 self=0xf99d30
I/dalvikvm(12364): | sysTid=12364 nice=0 sched=0/0 cgrp=default handle=1074107592
I/dalvikvm(12364): | schedstat=( 0 0 0 ) utm=18 stm=7 core=0
I/dalvikvm(12364): at dalvik.system.NativeStart.main(Native Method)
I/dalvikvm(12364):
E/dalvikvm(12364): VM aborting
F/libc (12364): Fatal signal 11 (SIGSEGV) at 0xdeadd00d (code=1)
I/DEBUG ( 4218): debuggerd: 2012-08-02 14:29:57
I/DEBUG ( 4218): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
I/DEBUG ( 4218): Build fingerprint: 'htc_asia_tw/htc_pyramid/pyramid:4.0.3/IML74K/391535.6:user/release-keys'
I/DEBUG ( 4218): pid: 12364, tid: 12364 >>> app_process <<<
I/DEBUG ( 4218): signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr deadd00d
When I exec these code in java,device 1 and 2 don't work.They have the same error.About device 3,I don't know the result,because someone get back his device.
help!any ideas?
It seems like that when launching dalvikvm, your LD_LIBRARY_PATH is not correctly set in the environment.
In ICS & JB, dalvikvm requires LD_LIBRARY_PATH to have certain path in it. The default is /vendor/lib:/system/lib, although usually /system/lib is enough. Else you would see the exception.
You may try to add export LD_LIBRARY_PATH=/vendor/lib:/system/lib after the su command in your script.
If your euid does not match your uid, LD_LIBRARY_PATH may be stripped from the environment. You can use id and id -r after su to check if they match. You may also check if /system/bin/mksh is setuid'ed, since this may also cause the problem.
来源：https://stackoverflow.com/questions/11773506/how-to-launch-jar-with-exec-app-process-on-android-ics