因此,这里是字节码的片段,我正在尝试使用ASM的类验证,验证:ClassNotFound的错误
public <init>(Ljava/io/InputStream;)V
ALOAD 0
ALOAD 1
SIPUSH 2048
NEW org/apache/xerces/impl/msg/XMLMessageFormatter
DUP
INVOKESPECIAL org/apache/xerces/impl/msg/XMLMessageFormatter.<init>()V
INVOKESTATIC java/util/Locale.getDefault()Ljava/util/Locale;
INVOKESPECIAL org/apache/xerces/impl/io/UTF8Reader.<init> (Ljava/io/InputStream;ILorg/apache/xerces/util/MessageFormatter;Ljava/util/Locale;)V
RETURN
MAXSTACK = 5
MAXLOCALS = 2
这是属于较大类org/apache/xerces/impl/io/UTF8Reader的一部分。现在,当我通过ASM提供的验证类运行这个类的字节码,我得到如下结果:
org.objectweb.asm.tree.analysis.AnalyzerException: **Error at instruction 7: java.lang.ClassNotFoundException: org.apache.xerces.util.MessageFormatter**
at org.objectweb.asm.tree.analysis.Analyzer.analyze(Unknown Source)
at org.objectweb.asm.util.CheckClassAdapter.verify(Unknown Source)
at org.objectweb.asm.util.CheckClassAdapter.verify(Unknown Source)
at org.objectweb.asm.util.CheckClassAdapter.main(Unknown Source)
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: org.apache.xerces.util.MessageFormatter
at org.objectweb.asm.tree.analysis.SimpleVerifier.getClass(Unknown Source)
at org.objectweb.asm.tree.analysis.SimpleVerifier.isAssignableFrom(Unknown Source)
at org.objectweb.asm.tree.analysis.SimpleVerifier.isSubTypeOf(Unknown Source)
at org.objectweb.asm.tree.analysis.BasicVerifier.naryOperation(Unknown Source)
at org.objectweb.asm.tree.analysis.BasicVerifier.naryOperation(Unknown Source)
at org.objectweb.asm.tree.analysis.Frame.execute(Unknown Source)
... 4 more
<init>(Ljava/io/InputStream;)V
00000 UTF8Reader InputStream : : ALOAD 0
00001 UTF8Reader InputStream : UTF8Reader : ALOAD 1
00002 UTF8Reader InputStream : UTF8Reader InputStream : SIPUSH 2048
00003 UTF8Reader InputStream : UTF8Reader InputStream I : NEW org/apache/xerces/impl/msg/XMLMessageFormatter
00004 UTF8Reader InputStream : UTF8Reader InputStream I XMLMessageFormatter : DUP
00005 UTF8Reader InputStream : UTF8Reader InputStream I XMLMessageFormatter XMLMessageFormatter : INVOKESPECIAL org/apache/xerces/impl/msg/XMLMessageFormatter.<init>()V
00006 UTF8Reader InputStream : UTF8Reader InputStream I XMLMessageFormatter : INVOKESTATIC java/util/Locale.getDefault()Ljava/util/Locale;
00007 UTF8Reader InputStream : UTF8Reader InputStream I XMLMessageFormatter Locale : INVOKESPECIAL org/apache/xerces/impl/io/UTF8Reader.<init> (Ljava/io/InputStream;ILorg/apache/xerces/util/MessageFormatter;Ljava/util/Locale;)V
00008 ? : RETURN
我深受这最后有点迷茫......为什么它给了ClassNotFound的第7行的org/apache/xerces/util/MessageFormatter对象异常?
谢谢。
我熟悉Java而不是ASM。一些想法(道歉,如果这些太明显):所以你通过ASM加载UTF8Reader字节码?整个xerces jar是以这种方式加载的吗?或者只是一些课程? MessageFormatter如何?如果没有,你期望它进入classpath并加载? (可以帮助你知道你是如何调用ASM的。) – Will 2012-07-09 21:19:29
所以我通过java.lang.instrument加载UTF8Reader和MessageFormatter。我基本上是编写一个java代理,它可以加载类的时间检测。现在,在加载类的字节码时,我将它们分别存储在它们自己的文件中,我将其用于稍后在脱机过程中进行验证,即在程序成功执行后进行验证。请注意,程序正在成功执行。谢谢。 – vijay 2012-07-09 21:46:36
也,这可能也有帮助,http://mail-archive.ow2.org/asm/2011-08/msg00051.html这是否有任何意义?再次感谢。 – vijay 2012-07-09 21:49:51