Question

尝试使用Java中的kafka.connect.data.Schema在特定对象类型的数组架构内创建并填充string类型的数组架构。但是出错了

org.apache.kafka.connect.errors.DataException：结构模式不匹配。在org.apache.kafka.connect.data.ConnectSchema.validateValue（ConnectSchema.java:239）在org.apache.kafka.connect.data.ConnectSchema.validateValue（ConnectSchema.java:245）在org.apache.kafka.connect.data.Struct.put（Struct.java:215）在org.apache.kafka.connect.data.Struct.put（Struct.java:204）在com.sintec.ra.fixture.BookProgramFixture.createAiringStruct（BookProgramFixture.java:60）在com.sintec.ra.handlers.BookProgramTopicHandlerTest.mockAiringStruct（BookProgramTopicHandlerTest.java:132）在com.sintec.ra.handlers.BookProgramTopicHandlerTest.init（BookProgramTopicHandlerTest.java:107）在com.sintec.ra.handlers.BookProgramTopicHandlerTest。（BookProgramTopicHandlerTest.java:76）在sun.reflect.NativeConstructorAccessorImpl.newInstance0（本机方法）处在sun.reflect.NativeConstructorAccessorImpl.newInstance（NativeConstructorAccessorImpl.java:62）在sun.reflect.DelegatingConstructorAccessorImpl.newInstance（DelegatingConstructorAccessorImpl.java:45）在java.lang.reflect.Constructor.newInstance（Constructor.java:423）在org.junit.runners.BlockJUnit4ClassRunner.createTest（BlockJUnit4ClassRunner.java:217）在org.junit.runners.BlockJUnit4ClassRunner $ 1.runReflectiveCall（BlockJUnit4ClassRunner.java:266）在org.junit.internal.runners.model.ReflectiveCallable.run（ReflectiveCallable.java:12）在org.junit.runners.BlockJUnit4ClassRunner.methodBlock（BlockJUnit4ClassRunner.java:263）在org.junit.runners.BlockJUnit4ClassRunner.runChild（BlockJUnit4ClassRunner.java:78）在org.junit.runners.BlockJUnit4ClassRunner.runChild（BlockJUnit4ClassRunner.java:57）在org.junit.runners.ParentRunner $ 3.run（ParentRunner.java:290）在org.junit.runners.ParentRunner $ 1.schedule（ParentRunner.java:71）在org.junit.runners.ParentRunner.runChildren（ParentRunner.java:288）在org.junit.runners.ParentRunner.access $ 000（ParentRunner.java:58）在org.junit.runners.ParentRunner上$ 2.evaluate（ParentRunner.java:268）在org.junit.runners.ParentRunner.run（ParentRunner.java:363）在org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run（JUnit4TestReference.java:86）在org.eclipse.jdt.internal.junit.runner.TestExecution.run（TestExecution.java:38）在org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests（RemoteTestRunner.java:538）在org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests（RemoteTestRunner.java:760）在org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run（RemoteTestRunner.java:460）在org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main（RemoteTestRunner.java:206）例如

"airingTo" : [ {
      "dow" : [ "SATURDAY" ]
      }]

public static Struct createAiringStruct() 
{
    Schema valueSchema = createValueSchemaForProgram();
    Struct valueStruct = new Struct(valueSchema).put("airingTo", 
    getAiringList());
    return valueStruct;
}

private static Schema createValueSchemaForProgram() 
{
    return 
    SchemaBuilder.struct().name("PROGRAM").field("airingTo", 
    SchemaBuilder.array(createAiringListSchema())).build();
}

private static Schema createAiringListSchema() 
{
   return SchemaBuilder.struct().name("airingTo").field("dow", 
   SchemaBuilder.array(Schema.STRING_SCHEMA)).build();
}

private static List<Struct> getAiringList() 
{
    Struct valueStruct = new 
    Struct(createAiringListSchema()).put("dow", 
    Arrays.asList("SATURDAY"));
    List<Struct> dayPartList = new ArrayList<>();
    dayPartList.add(valueStruct);
    return dayPartList;
}

Answer 1

不确定.name("PROGRAM")的去向，但这似乎对我有用。

似乎您正在将结构名称与字段混合。

    Schema dowSchema = SchemaBuilder.array(Schema.STRING_SCHEMA).build();
    Schema airingToItemSchema = SchemaBuilder.struct()
            .field("dow", dowSchema)
            .build();
    Schema airingToSchema = SchemaBuilder.array(airingToItemSchema).build();
    Schema rootSchema = SchemaBuilder.struct()
            .field("airingTo", airingToSchema);
            .build();

    Struct item = new Struct(airingToItemSchema)
            .put("dow", Collections.singletonList("SATURDAY"));
    Struct rootStruct = new Struct(rootSchema)
            .put("airingTo", Collections.singletonList(item));

    System.out.println(rootStruct);

输出

Struct{airingTo=[Struct{dow=[SATURDAY]}]}

org.apache.kafka.connect.errors.DataException：结构模式不匹配

1 个答案: