出于某种原因,我想通过 adb 在 Android Runtime (ART) 上运行Dacapo Benchmark 。以下是运行的步骤:
# convert all .class bytecode in dacapo.jar to .dex bytecode
java -jar dx.jar --dex --output=classes.dex $(find . -name "*.class")
adb push classes.dex /sdcard/dacapo
# run the 'fop' benchmark
adb shell app_process -Djava.class.path=/sdcard/dacapo/classes.dex /sdcard/dacapo Harness fop
但是,我得到了异常信息:
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String java.net.URL.getProtocol()' on a null object reference
at org.dacapo.harness.CommandLineArgs.extractBenchmarkSet(Unknown Source:52)
at org.dacapo.harness.CommandLineArgs.<init>(Unknown Source:600)
at org.dacapo.harness.TestHarness.main(Unknown Source:64)
at java.lang.reflect.Method.invoke(Native Method)
at Harness.main(Unknown Source:91)
at com.android.internal.os.RuntimeInit.nativeFinishInit(Native Method)
at com.android.internal.os.RuntimeInit.main(RuntimeInit.java:399)
我查看了 Dacapo 的源代码,找到了异常的来源:
public class CommandLineArgs{
static List<String> extractBenchmarkSet() throws IOException {
List<String> benchmarks = new ArrayList<String>();
URL url = CommandLineArgs.class.getClassLoader().getResource("cnf");
String protocol = url.getProtocol();
...
}
}
如您所见,getResource("cnf")
返回一个null
引用。原因是dacapo.jar中有一些资源,但是dx.jar
没有任何资源文件,只能将.class转为.dex。
我也尝试将cnf
资源放入/sdcard/
,/sdcard/dacapo
但仍然失败。
那么如何让 .dex 字节码访问cnf
资源呢?