因此,這裏是字節碼的片段,我正在嘗試使用ASM的類驗證,驗證:ClassNotFound的錯誤
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
這是屬於較大類org/apache/xerces/impl/io/UTF8Reader的一部分。現在,當我通過ASM提供的驗證類運行這個類的字節碼,我得到如下結果:
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
我深受這最後有點迷茫......爲什麼它給了ClassNotFound的第7行的org/apache/xerces/util/MessageFormatter對象異常?
謝謝。
我熟悉Java而不是ASM。一些想法(道歉,如果這些太明顯):所以你通過ASM加載UTF8Reader字節碼?整個xerces jar是以這種方式加載的嗎?或者只是一些課程? MessageFormatter如何?如果沒有,你期望它進入classpath並加載? (可以幫助你知道你是如何調用ASM的。) – Will 2012-07-09 21:19:29
所以我通過java.lang.instrument加載UTF8Reader和MessageFormatter。我基本上是編寫一個java代理,它可以加載類的時間檢測。現在,在加載類的字節碼時,我將它們分別存儲在它們自己的文件中,我將其用於稍後在脫機過程中進行驗證,即在程序成功執行後進行驗證。請注意,程序正在成功執行。謝謝。 – vijay 2012-07-09 21:46:36
也,這可能也有幫助,http://mail-archive.ow2.org/asm/2011-08/msg00051.html這是否有任何意義?再次感謝。 – vijay 2012-07-09 21:49:51