小编use*_*535的帖子

postgres的最新Java JDBC驱动程序声称本机支持UUID; 与Postgres 9.2(mac)对抗.

实际上,当使用PreparedStatement时,我可以单步执行驱动程序代码,甚至可以遍历AbstractJdbc3gStatement.java中专门的"setUuid"函数.根据所有迹象,它应该"正常工作".

但是,它不起作用.数据库收回错误,我收到错误:

Caused by: org.postgresql.util.PSQLException: ERROR: operator does not exist: uuid = bytea
  Hint: No operator matches the given name and argument type(s). You might need to add explicit type casts.
  Position: 139
    at org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2157) ~[postgresql-9.2-1002.jdbc4.jar:na]

是的,确实,JDBC驱动程序中的setUuid会将其作为bytea发送:

private void setUuid(int parameterIndex, UUID uuid) throws SQLException {
        if (connection.binaryTransferSend(Oid.UUID)) {
            byte[] val = new byte[16];
            ByteConverter.int8(val, 0, uuid.getMostSignificantBits());
            ByteConverter.int8(val, 8, uuid.getLeastSignificantBits());
            bindBytes(parameterIndex, val, Oid.UUID);
        } else {
            bindLiteral(parameterIndex, uuid.toString(), Oid.UUID);
        }
    }

是什么赋予了？实际数据库中是否需要一些魔法符文来祝福这种转换？

我似乎无法正确注册我的Jackson ObjectMapper模块.

我正在使用Guice + Jersey + Jackson(FasterXML)堆栈.

我已经按照如何基于各种问题自定义了ObjectMapper.特别是,我声明了一个ContextResolver,标记为@ javax.ws.rs.ext.Provider和@javax.inject.Singleton.

我有一个GuiceServletContextListener:

@Override
protected Injector getInjector() {

     Injector injector = Guice.createInjector(new DBModule(dataSource),
            new ServletModule()
            {
                @Override
                protected void configureServlets() {


                    // Mapper
                    bind(JacksonOMP.class).asEagerSingleton();

                    // ... 

                    Map<String, String> initParams = new HashMap<String, String>();
                    initParams.put("com.sun.jersey.config.feature.Trace",
                            "true");
                    initParams.put("com.sun.jersey.api.json.POJOMappingFeature", "true");

                    serve("/services/*").with(
                            GuiceContainer.class,
                            initParams);
                }
            });

    return injector;
}

映射器已定义

import javax.inject.Singleton;
import javax.ws.rs.Produces;
import javax.ws.rs.ext.ContextResolver;
import javax.ws.rs.ext.Provider;

@Provider
@Singleton
@Produces
public class JacksonOMP implements ContextResolver<ObjectMapper> {

  @Override
  public ObjectMapper getContext(Class<?> aClass) {
    final ObjectMapper mapper = …