Question

我是Spring Framework MVC和LDAP的新手。我试图制作RESTful API，实际上我已经做到了。我可以通过调用apis来获取其他json对象。但是当这些是LDAP类时，我无法获得json对象。我的意思是我认为LDAP类不能转换为json对象。

哪些LDAP类意味着类具有此批注： @Entry（objectClasses = {＆＃34; inetOrgPerson＆＃34;，＆＃34; organizationalPerson＆＃34;，＆＃34; person＆＃34;，＆＃34; top＆＃34;}，base =＆＃34; ou =人＆＃34）

当我尝试通过调用rest apis来获取json对象时，这是消息： org.springframework.http.converter.HttpMessageNotWritableException：无法编写JSON：找不到类javax.naming.ldap.LdapName $ 1的序列化程序，并且没有发现创建BeanSerializer的属性（以避免异常，禁用SerializationFeature.FAIL_ON_EMPTY_BEANS））（通过参考链）：org.springframework.ldap.samples.useradmin.domain.User [＆＃34; id＆＃34;] - ＆gt; javax.naming.ldap.LdapName [＆＃34; all＆＃34;]）;嵌套异常是com.fasterxml.jackson.databind.JsonMappingException：找不到类javax.naming.ldap.LdapName $ 1的序列化器，并且没有发现创建BeanSerializer的属性（为了避免异常，禁用SerializationFeature.FAIL_ON_EMPTY_BEANS））（通过引用链：org .springframework.ldap.samples.useradmin.domain.User [＆＃34; ID＆＃34;] - ＆GT; javax.naming.ldap.LdapName中[＆＃34;所有＆＃34;]）在org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.writeInternal（MappingJackson2HttpMessageConverter.java:207）在org.springframework.http.converter.AbstractHttpMessageConverter.write（AbstractHttpMessageConverter.java:179）在org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters（AbstractMessageConverterMethodProcessor.java:148）在org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters（AbstractMessageConverterMethodProcessor.java:90）在org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue（RequestResponseBodyMethodProcessor.java:189）在org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue（HandlerMethodReturnValueHandlerComposite.java:69）在org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle（ServletInvocableHandlerMethod.java:122）在org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod（RequestMappingHandlerAdapter.java:745）在org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal（RequestMappingHandlerAdapter.java:686）在org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle（AbstractHandlerMethodAdapter.java:80）在org.springframework.web.servlet.DispatcherServlet.doDispatch（DispatcherServlet.java:925）在org.springframework.web.servlet.DispatcherServlet.doService（DispatcherServlet.java:856）在org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:953）在org.springframework.web.servlet.FrameworkServlet.doGet（FrameworkServlet.java:844）在javax.servlet.http.HttpServlet.service（HttpServlet.java:735）在org.springframework.web.servlet.FrameworkServlet.service（FrameworkServlet.java:829）在javax.servlet.http.HttpServlet.service（HttpServlet.java:848）在org.eclipse.jetty.servlet.ServletHolder.handle（ServletHolder.java:684）在org.eclipse.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1496）在org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal（HiddenHttpMethodFilter.java:77）在org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）在org.eclipse.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1476）在org.eclipse.jetty.servlet.ServletHandler.doHandle（ServletHandler.java:499）在org.eclipse.jetty.server.handler.ScopedHandler.handle（ScopedHandler.java:137）在org.eclipse.jetty.security.SecurityHandler.handle（SecurityHandler.java:557）在org.eclipse.jetty.server.session.SessionHandler.doHandle（SessionHandler.java:231） at org.eclipse.jetty.server.handler.ContextHandler.doHandle（ContextHandler.java:1086）在org.eclipse.jetty.servlet.ServletHandler.doScope（ServletHandler.java:428）在org.eclipse.jetty.server.session.SessionHandler.doScope（SessionHandler.java:193）在org.eclipse.jetty.server.handler.ContextHandler.doScope（ContextHandler.java:1020）在org.eclipse.jetty.server.handler.ScopedHandler.handle（ScopedHandler.java:135） at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle（ContextHandlerCollection.java:255）在org.eclipse.jetty.server.handler.HandlerCollection.handle（HandlerCollection.java:154）在org.eclipse.jetty.server.handler.HandlerWrapper.handle（HandlerWrapper.java:116）在org.eclipse.jetty.server.Server.handle（Server.java:370） at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest（AbstractHttpConnection.java:494） at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete（AbstractHttpConnection.java:971） at org.eclipse.jetty.server.AbstractHttpConnection $ RequestHandler.headerComplete（AbstractHttpConnection.java:1033）在org.eclipse.jetty.http.HttpParser.parseNext（HttpParser.java:644）在org.eclipse.jetty.http.HttpParser.parseAvailable（HttpParser.java:235） at org.eclipse.jetty.server.AsyncHttpConnection.handle（AsyncHttpConnection.java:82）在org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle（SelectChannelEndPoint.java:667）在org.eclipse.jetty.io.nio.SelectChannelEndPoint $ 1.run（SelectChannelEndPoint.java:52）在org.eclipse.jetty.util.thread.QueuedThreadPool.runJob（QueuedThreadPool.java:608）在org.eclipse.jetty.util.thread.QueuedThreadPool $ 3.run（QueuedThreadPool.java:543）在java.lang.Thread.run（Thread.java:745）引起：com.fasterxml.jackson.databind.JsonMappingException：找不到类javax.naming.ldap.LdapName $ 1的序列化器，并且没有发现创建BeanSerializer的属性（为了避免异常，禁用SerializationFeature.FAIL_ON_EMPTY_BEANS））（通过引用链：org .springframework.ldap.samples.useradmin.domain.User [＆＃34; ID＆＃34;] - ＆GT; javax.naming.ldap.LdapName中[＆＃34;所有＆＃34;]）在com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.failForEmpty（UnknownSerializer.java:59） at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.serialize（UnknownSerializer.java:26）在com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField（BeanPropertyWriter.java:569）在com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields（BeanSerializerBase.java:597） at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize（BeanSerializer.java:142）在com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField（BeanPropertyWriter.java:569）在com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields（BeanSerializerBase.java:597） at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize（BeanSerializer.java:142）在com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue（DefaultSerializerProvider.java:118） at com.fasterxml.jackson.databind.ObjectMapper.writeValue（ObjectMapper.java:1819）在org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.writeInternal（MappingJackson2HttpMessageConverter.java:204） ......还有45个引起：

com.fasterxml.jackson.databind.JsonMappingException：找不到类javax.naming.ldap.LdapName $ 1的序列化程序，并且没有发现创建BeanSerializer的属性（为了避免异常，禁用SerializationFeature.FAIL_ON_EMPTY_BEANS））（通过引用链：org .springframework.ldap.samples.useradmin.domain.User [＆＃34; ID＆＃34;] - ＆GT; javax.naming.ldap.LdapName中[＆＃34;所有＆＃34;]）在com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.failForEmpty（UnknownSerializer.java:59） at com.fasterxml.jackson.databind.ser.impl.UnknownSerializer.serialize（UnknownSerializer.java:26）在com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField（BeanPropertyWriter.java:569）在com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields（BeanSerializerBase.java:597） at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize（BeanSerializer.java:142）在com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField（BeanPropertyWriter.java:569）在com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields（BeanSerializerBase.java:597） at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize（BeanSerializer.java:142）在com.fasterxml.jackson.databind.ser.DefaultSerializerProvider.serializeValue（DefaultSerializerProvider.java:118） at com.fasterxml.jackson.databind.ObjectMapper.writeValue（ObjectMapper.java:1819）在org.springframework.http.converter.json.MappingJackson2HttpMessageConverter.writeInternal（MappingJackson2HttpMessageConverter.java:204）在org.springframework.http.converter.AbstractHttpMessageConverter.write（AbstractHttpMessageConverter.java:179）在org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters（AbstractMessageConverterMethodProcessor.java:148）在org.springframework.web.servlet.mvc.method.annotation.AbstractMessageConverterMethodProcessor.writeWithMessageConverters（AbstractMessageConverterMethodProcessor.java:90）在org.springframework.web.servlet.mvc.method.annotation.RequestResponseBodyMethodProcessor.handleReturnValue（RequestResponseBodyMethodProcessor.java:189）在org.springframework.web.method.support.HandlerMethodReturnValueHandlerComposite.handleReturnValue（HandlerMethodReturnValueHandlerComposite.java:69）在org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle（ServletInvocableHandlerMethod.java:122）在org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandleMethod（RequestMappingHandlerAdapter.java:745）在org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal（RequestMappingHandlerAdapter.java:686）在org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle（AbstractHandlerMethodAdapter.java:80）在org.springframework.web.servlet.DispatcherServlet.doDispatch（DispatcherServlet.java:925）在org.springframework.web.servlet.DispatcherServlet.doService（DispatcherServlet.java:856）在org.springframework.web.servlet.FrameworkServlet.processRequest（FrameworkServlet.java:953）在org.springframework.web.servlet.FrameworkServlet.doGet（FrameworkServlet.java:844）在javax.servlet.http.HttpServlet.service（HttpServlet.java:735）在org.springframework.web.servlet.FrameworkServlet.service（FrameworkServlet.java:829）在javax.servlet.http.HttpServlet.service（HttpServlet.java:848）在org.eclipse.jetty.servlet.ServletHolder.handle（ServletHolder.java:684）在org.eclipse.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1496）在org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal（HiddenHttpMethodFilter.java:77）在org.springframework.web.filter.OncePerRequestFilter.doFilter（OncePerRequestFilter.java:107）在org.eclipse.jetty.servlet.ServletHandler $ CachedChain.doFilter（ServletHandler.java:1476）在org.eclipse.jetty.servlet.ServletHandler.doHandle（ServletHandler.java:499）在org.eclipse.jetty.server.handler.ScopedHandler.handle（ScopedHandler.java:137）在org.eclipse.jetty.security.SecurityHandler.handle（SecurityHandler.java:557）在org.eclipse.jetty.server.session.SessionHandler.doHandle（SessionHandler.java:231） at org.eclipse.jetty.server.handler.ContextHandler.doHandle（ContextHandler.java:1086）在org.eclipse.jetty.servlet.ServletHandler.doScope（ServletHandler.java:428）在org.eclipse.jetty.server.session.SessionHandler.doScope（SessionHandler.java:193）在org.eclipse.jetty.server.handler.ContextHandler.doScope（ContextHandler.java:1020）在org.eclipse.jetty.server.handler.ScopedHandler.handle（ScopedHandler.java:135） at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle（ContextHandlerCollection.java:255）在org.eclipse.jetty.server.handler.HandlerCollection.handle（HandlerCollection.java:154）在org.eclipse.jetty.server.handler.HandlerWrapper.handle（HandlerWrapper.java:116）在org.eclipse.jetty.server.Server.handle（Server.java:370） at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest（AbstractHttpConnection.java:494） at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete（AbstractHttpConnection.java:971） at org.eclipse.jetty.server.AbstractHttpConnection $ RequestHandler.headerComplete（AbstractHttpConnection.java:1033）在org.eclipse.jetty.http.HttpParser.parseNext（HttpParser.java:644）在org.eclipse.jetty.http.HttpParser.parseAvailable（HttpParser.java:235） at org.eclipse.jetty.server.AsyncHttpConnection.handle（AsyncHttpConnection.java:82）在org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle（SelectChannelEndPoint.java:667）在org.eclipse.jetty.io.nio.SelectChannelEndPoint $ 1.run（SelectChannelEndPoint.java:52）在org.eclipse.jetty.util.thread.QueuedThreadPool.runJob（QueuedThreadPool.java:608）在org.eclipse.jetty.util.thread.QueuedThreadPool $ 3.run（QueuedThreadPool.java:543）在java.lang.Thread.run（Thread.java:745）

Answer 1

此错误意味着-无法序列化JSON数据并将其发送到前端，甚至无法正常进行反序列化。将@JSONIgnore用作id变量。根据我的代码，这对我有用。

wyborZadania* obj = new wyborZadania(numerZad,[this](){ tab(); };

Answer 2

我的解决方案如下

private String wrapDN(Name dn) {
    Enumeration<String> allElements = dn.getAll();
    StringBuilder value = new StringBuilder();
    while (allElements.hasMoreElements()) {
        value.append(allElements.nextElement());
        value.append(",");
    }
    value.deleteCharAt(value.length() - 1);
    return value.toString();
}

然后将值作为字符串返回

Answer 3

这对我有用。每个LdapUser的模型类：

@Id
private Name dn;

//other vars, getters, setters are here

public String getDn() {
        return dn.toString();
    }

@Override
    public String toString() {
        return String.valueOf(dn);
    }

Answer 4

如果你使用jackson进行序列化，你可以添加这样的类：

@JsonComponent
public class LdapNameSerializer extends JsonSerializer<LdapName> {

    @Override
    public void serialize(LdapName ldapName, JsonGenerator jsonGenerator,
      SerializerProvider serializerProvider) throws IOException {
        jsonGenerator.writeString(ldapName.toString());
    }
}

没有找到类javax.naming.ldap.LdapName $ 1的序列化程序

4 个答案: