檢測類文件時出錯 (asm.ClassWriter.getCommonSuperClass)

Question

在儀器上出現錯誤

java.lang.RuntimeException: java.lang.ClassNotFoundException: Deposit
    at org.objectweb.asm.ClassWriter.getCommonSuperClass(Unknown Source)
    at org.objectweb.asm.ClassWriter.a(Unknown Source)
    at org.objectweb.asm.Frame.a(Unknown Source)
    at org.objectweb.asm.Frame.a(Unknown Source)
    at org.objectweb.asm.MethodWriter.visitMaxs(Unknown Source)
    at com.jConSequence.instrumentor.methodProber.AdddataBaseDetailsInstructions$AdddataBaseDetailsMethodInstructions.visitMaxs(AdddataBaseDetailsInstructions.java:131)
    at org.objectweb.asm.ClassReader.accept(Unknown Source)
    at org.objectweb.asm.ClassReader.accept(Unknown Source)
    at com.jConSequence.instrumentor.PrintLoadedClasses.print(PrintLoadedClasses.java:31)
    at com.jConSequence.tooGUI.RevEnggToolGUI.jButton1ActionPerformed(RevEnggToolGUI.java:487)
    at com.jConSequence.tooGUI.RevEnggToolGUI.access$0(RevEnggToolGUI.java:471)
    at com.jConSequence.tooGUI.RevEnggToolGUI$1.actionPerformed(RevEnggToolGUI.java:127)
    at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
    at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
    at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
    at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)
    at java.awt.Component.processMouseEvent(Unknown Source)
    at javax.swing.JComponent.processMouseEvent(Unknown Source)
    at java.awt.Component.processEvent(Unknown Source)
    at java.awt.Container.processEvent(Unknown Source)
    at java.awt.Component.dispatchEventImpl(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
    at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
    at java.awt.Container.dispatchEventImpl(Unknown Source)
    at java.awt.Window.dispatchEventImpl(Unknown Source)
    at java.awt.Component.dispatchEvent(Unknown Source)
    at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
    at java.awt.EventQueue.access$000(Unknown Source)
    at java.awt.EventQueue$1.run(Unknown Source)
    at java.awt.EventQueue$1.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue$2.run(Unknown Source)
    at java.awt.EventQueue$2.run(Unknown Source)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
    at java.awt.EventQueue.dispatchEvent(Unknown Source)
    at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
    at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
    at java.awt.EventDispatchThread.run(Unknown Source)

在檢測課程時

D:\workspaces\workspace\bankManagement\bin\Account.class
D:\workspaces\workspace\bankManagement\bin\ATM.class
D:\workspaces\workspace\bankManagement\bin\ATMCaseStudy.class
D:\workspaces\workspace\bankManagement\bin\BalanceInquiry.class
D:\workspaces\workspace\bankManagement\bin\BankDatabase.class
D:\workspaces\workspace\bankManagement\bin\CashDispenser.class
D:\workspaces\workspace\bankManagement\bin\Deposit.class
D:\workspaces\workspace\bankManagement\bin\DepositSlot.class
D:\workspaces\workspace\bankManagement\bin\Keypad.class
D:\workspaces\workspace\bankManagement\bin\Screen.class
D:\workspaces\workspace\bankManagement\bin\Transaction.class

我正在使用 apache commonsIO 將上面的一組類作為字節流讀取。

然后使用 asm 庫檢測它們。

最后它們被轉換成類文件。

正是在這一點上，我收到了這個錯誤任何人都可以解釋原因和可能的解決方案。

Answer 1

發生此錯誤是因為 ASM 正在生成堆棧映射幀，並且對於某些字節碼，堆棧映射幀必須包含兩個類的公共超類。 默認情況下，ASM通過 Class.forName加載類來實現這一點，然后使用反射實現適當的算法。 據推測，ASM 庫無法從其類加載器加載您的 Deposit 類。

為避免該錯誤，您需要使用 SKIP_FRAMES（注意：Java 7 使用的類文件版本 51.0 需要堆棧映射幀，因此如果您生成 Java 7 字節碼，這是不可選擇的），或者您需要繼承 ClassWriter 並覆蓋 getCommonSuperClass。 根據您的代碼在做什么，也許您可以使用字符串比較對答案進行硬編碼，或者您可以采用 ASM 實現並重寫它以使用您指定的 ClassLoader。

Answer 2

我也遇到了這個問題。 在嘗試編寫自己的 ClassWriter 並在 Internet 上搜索之后，我終於找到了一個非常適合我的實現： SafeClassWriter.java

希望它會有所幫助。