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長時間開いている接続を監視するために、java.sql.Connection型のサブクラスにフィールドを追加しようとしています（例えば接続漏れ）。クラスにフィールドを追加すると、 "<constructor>はインデックス2を定義しません"
これは私が実行しようとしていますものです：
public class TransactionMonitorVisitor {
interface FieldSetter {
void setField(String value);
}
interface FieldGetter {
String getValue();
}
public static class ConnectionConstructorVisitor {
@Advice.OnMethodExit
public static void intercept(@Advice.Origin Constructor<?> constructor,
@Advice.This Object obj,
@FieldProxy("__txUuid__") FieldSetter accessor
) {
String txUuid = UUID.randomUUID().toString();
System.out.println("Visiting constructor: txUuid=" + txUuid + ", obj=" + obj);
accessor.setField(txUuid);
}
}
public static class ConnectionMethodVisitor {
@Advice.OnMethodExit
public static void intercept(@Advice.Origin Method method,
@FieldProxy("__txUuid__") FieldGetter accessor
) {
String methodName = method.getName();
String txUuid = accessor.getValue();
System.out.println("Visiting method: txUuid=" + txUuid + ", method=" + methodName);
}
}
public static void installOn(Instrumentation instrumentation) throws Exception {
new AgentBuilder.Default()
.type(ElementMatchers.isSubTypeOf(Connection.class))
.transform((builder, typeDescription, classLoader, javaModule) ->
builder.defineField("__txUuid__", String.class)
.visit(Advice.to(ConnectionConstructorVisitor.class).on((ElementMatchers.isConstructor())))
.visit(Advice.to(ConnectionMethodVisitor.class).on(ElementMatchers.nameMatches("commit|rollback|close")))
)
.with(AgentBuilder.Listener.StreamWriting.toSystemError())
.installOn(instrumentation);
System.out.println("Installed :: " + TransactionMonitorVisitor.class.getName());
}
}
私は自分のアプリケーション（Tomcatの中のWebアプリ）を起動すると、私は次のエラーを取得：いくつかの研究に基づいて
java.lang.IllegalStateException: net.sourceforge.jtds.jdbc.ConnectionJDBC3(java.lang.String,java.util.Properties) throws java.sql.SQLException does not define an index 2
at net.bytebuddy.asm.Advice$OffsetMapping$ForArgument$Unresolved.resolve(Advice.java:1551)
at net.bytebuddy.asm.Advice$OffsetMapping$ForArgument.resolve(Advice.java:1462)
at net.bytebuddy.asm.Advice$OffsetMapping$ForArgument$Unresolved.resolve(Advice.java:1564)
at net.bytebuddy.asm.Advice$Dispatcher$Inlining$Resolved$ForMethodExit.apply(Advice.java:5818)
at net.bytebuddy.asm.Advice$Dispatcher$Inlining$Resolved$AdviceMethodInliner.visitMethod(Advice.java:5414)
at net.bytebuddy.jar.asm.ClassReader.b(Unknown Source)
at net.bytebuddy.jar.asm.ClassReader.accept(Unknown Source)
at net.bytebuddy.jar.asm.ClassReader.accept(Unknown Source)
at net.bytebuddy.asm.Advice$Dispatcher$Inlining$Resolved$AdviceMethodInliner.doApply(Advice.java:5408)
at net.bytebuddy.asm.Advice$Dispatcher$Inlining$Resolved$ForMethodExit$AdviceMethodInliner.apply(Advice.java:5902)
at net.bytebuddy.asm.Advice$AdviceVisitor$WithExitAdvice.onUserEnd(Advice.java:7503)
at net.bytebuddy.asm.Advice$AdviceVisitor.visitMaxs(Advice.java:7251)
at net.bytebuddy.jar.asm.ClassReader.a(Unknown Source)
at net.bytebuddy.jar.asm.ClassReader.b(Unknown Source)
at net.bytebuddy.jar.asm.ClassReader.accept(Unknown Source)
at net.bytebuddy.jar.asm.ClassReader.accept(Unknown Source)
at net.bytebuddy.dynamic.scaffold.TypeWriter$Default$ForInlining.create(TypeWriter.java:2941)
at net.bytebuddy.dynamic.scaffold.TypeWriter$Default.make(TypeWriter.java:1633)
at net.bytebuddy.dynamic.scaffold.inline.RebaseDynamicTypeBuilder.make(RebaseDynamicTypeBuilder.java:200)
at net.bytebuddy.agent.builder.AgentBuilder$Default$Transformation$Simple$Resolution.apply(AgentBuilder.java:8902)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.doTransform(AgentBuilder.java:9303)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.transform(AgentBuilder.java:9266)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.access$1300(AgentBuilder.java:9044)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$LegacyVmDispatcher.run(AgentBuilder.java:9622)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$LegacyVmDispatcher.run(AgentBuilder.java:9572)
at ...
を、私は.with(AgentBuilder.RedefinitionStrategy.RETRANSFORMATION)を追加しようとしましたが、それは上記と同じエラーが表示されます。
と組み合わせて.disableClassFormatChanges()を使用していた別の場所を見ましたが、それでもエラーが発生しません。新しいエラーは次のとおりです。
java.lang.IllegalStateException: Cannot define field for frozen type: class net.sourceforge.jtds.jdbc.ConnectionJDBC3
at net.bytebuddy.dynamic.scaffold.InstrumentedType$Frozen.withField(InstrumentedType.java:1149)
at net.bytebuddy.dynamic.DynamicType$Builder$AbstractBase$Adapter$FieldDefinitionAdapter.materialize(DynamicType.java:3159)
at net.bytebuddy.dynamic.DynamicType$Builder$AbstractBase$Delegator.visit(DynamicType.java:2571)
at com.calabrio.athena.tx.TransactionMonitorVisitor.lambda$installOn$0(TransactionMonitorVisitor.java:70)
at com.calabrio.athena.tx.TransactionMonitorVisitor$$Lambda$1/1528637575.transform(Unknown Source)
at net.bytebuddy.agent.builder.AgentBuilder$Transformer$Compound.transform(AgentBuilder.java:2335)
at net.bytebuddy.agent.builder.AgentBuilder$Default$Transformation$Simple$Resolution.apply(AgentBuilder.java:8899)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.doTransform(AgentBuilder.java:9303)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.transform(AgentBuilder.java:9266)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer.access$1300(AgentBuilder.java:9044)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$LegacyVmDispatcher.run(AgentBuilder.java:9622)
at net.bytebuddy.agent.builder.AgentBuilder$Default$ExecutingTransformer$LegacyVmDispatcher.run(AgentBuilder.java:9572)
私がしようとしていることは可能ですか？もしそうなら、私は行方不明になっていますか？