Как я могу изменить основной API в Java? ⇐ JAVA

[Гость]

for example：I want to change LocalDateTime.now() return result in non-production enviroment， I am trying to invoke the following code，but error occors：

@Test public void test3() { System.out.println(LocalDateTime.now()); Instrumentation instrumentation = ByteBuddyAgent.install(); Class[] cls = instrumentation.getAllLoadedClasses(); for (Class cl : cls) { if ("java.time.LocalDateTime".equals(cl.getName())) { try { LocalDateTime mockData = LocalDateTime.of(2020, 1, 1, 0, 0, 0, 0); byte[] bytes = new ByteBuddy() .redefine(LocalDateTime.class) .method(ElementMatchers.named("now").and(ElementMatchers.takesNoArguments())) .intercept(FixedValue.value(mockData)) .make() .getBytes(); ClassDefinition classDefinition = new ClassDefinition(cl, bytes); instrumentation.redefineClasses(classDefinition); } catch (Throwable e) { e.printStackTrace(); } } } System.out.println(LocalDateTime.now()); } 2024-03-03T15:33:59.291699 java.lang.UnsupportedOperationException: class redefinition failed: attempted to change the schema (add/remove fields) at java.instrument/sun.instrument.InstrumentationImpl.redefineClasses0(Native Method) at java.instrument/sun.instrument.InstrumentationImpl.redefineClasses(InstrumentationImpl.java:195) at com.yi.component.test.agent.bytecode.ByteBuddyTest.test3(ByteBuddyTest.java:76) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.base/java.lang.reflect.Method.invoke(Method.java:568) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:59) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:56) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17) at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306) at org.junit.runners.BlockJUnit4ClassRunner$1.evaluate(BlockJUnit4ClassRunner.java:100) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:366) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:103) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:63) at org.junit.runners.ParentRunner$4.run(ParentRunner.java:331) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:79) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:329) at org.junit.runners.ParentRunner.access$100(ParentRunner.java:66) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:293) at org.junit.runners.ParentRunner$3.evaluate(ParentRunner.java:306) at org.junit.runners.ParentRunner.run(ParentRunner.java:413) at org.junit.runner.JUnitCore.run(JUnitCore.java:137) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:69) at com.intellij.rt.junit.IdeaTestRunner$Repeater$1.execute(IdeaTestRunner.java:38) at com.intellij.rt.execution.junit.TestsRepeater.repeat(TestsRepeater.java:11) at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(IdeaTestRunner.java:35) at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:232) at com.intellij.rt.junit.JUnitStarter.main(JUnitStarter.java:55)

I want to change LocalDateTime.now() return result in non-production enviroment


Источник: https://stackoverflow.com/questions/780 ... pi-in-java