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POjQuery post can't get entity object as json
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8768848
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2012-01-07T10:01:52.927
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2012-01-11T17:29:14.703
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2012-01-11T17:29:14.703
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<p>I need to get my 'Comment' (stored in DAO) object from my controller and display it in my JSP but every time I see the error message from the error block.</p> <p>Why is this happenning and what should I do?</p> <p>Logic of my code is the next:</p> <ol> <li>After clicking on the 'Reply' button data from the form is sent to my controller.</li> <li>Controller saves data in DB and returns 'Comment' entity.</li> <li>I get this 'Comment' entity in my JSP page and use it for publishing on the page.</li> </ol> <p>But I get the error msg from error block instead of msg from the success block.</p> <p>Here is my form: </p> <pre><code><form id="comment_${comment.getCommentId()}"> <textarea class="textarea" rows="10" name="text"></textarea> <input type="hidden" name="bookId" value="${book.getBookId()}" /> <input type="hidden" name="parentId" /> <input type="hidden" name="commentId" value="${comment.getCommentId()}" /><br /> <input type="button" class="button" value="Reply" id="submit_${comment.getCommentId()}" onclick="ajaxsubmit(this.id)"/> </form> </code></pre> <p>Here is my script:</p> <pre><code><script type="text/javascript"> function ajaxsubmit(buttonId){ var formId = document.getElementById(buttonId).parentNode.id; var dataString = $("#" + formId).serialize(); $.ajax( { url: "ajaxcomment.htm", type: "post", data: dataString, dataType: "json", success: function(data) { alert(data.getCommentAdded()); }, error: function() { alert("error"); } } ); } </code></pre> <p>Here is my controller</p> <pre><code>@RequestMapping(value = "ajaxcomment.htm", method = RequestMethod.POST) public @ResponseBody Comment ajaxcomment( HttpServletRequest httpServletRequest, @RequestParam(value = "bookId", required = false) Long bookId, @RequestParam(value = "parentId", required = false) Long parentId, @RequestParam(value = "commentId", required = false) Long commentId, @RequestParam(value = "text", required = true) String text) { String username = httpServletRequest.getRemoteUser(); User user = userDao.getUserByUsername(username); Comment comment = new Comment(); // DAO logic commentDao.addComment(comment); return comment; } </code></pre> <p>Here is my 'Comment' entity:</p> <pre><code>@Entity @Table(name = "COMMENT") public class Comment implements Serializable { @Id @GeneratedValue @Column(name = "COMMENT_ID", nullable = false) private Long commentId; @Column(name = "COMMENT_TEXT", length = 512, nullable = true) private String commentText; @Column(name = "COMMENT_ADDED", length = 128, nullable = true) @Temporal(TemporalType.TIMESTAMP) private Date commentAdded; @ManyToOne(cascade = CascadeType.REFRESH, fetch = FetchType.EAGER) @JoinColumn(name = "BOOK_ID") private Book book; @ManyToOne(cascade = CascadeType.REFRESH, fetch = FetchType.EAGER) @JoinColumn(name = "PARENT_ID") private Comment parentComment; @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER, mappedBy = "parentComment") @OrderBy("commentAdded") private Collection<Comment> subcomments; public void setCommentText(String commentText) { this.commentText = commentText; } public String getCommentText() { return this.commentText; } // other getters and setters are public too </code></pre> <p>And here is my applicationContext.xml:</p> <pre><code><?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:mvc="http://www.springframework.org/schema/mvc" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"> <mvc:annotation-driven /> <context:component-scan base-package="com.demo"/> <context:component-scan base-package="com.demo.service"/> <context:annotation-config /> <bean id="viewResolver" class="org.springframework.web.servlet.view.UrlBasedViewResolver"> <property name="viewClass" value="org.springframework.web.servlet.view.JstlView"/> <property name="prefix" value="/WEB-INF/jsp/"/> <property name="suffix" value=".jsp"/> </bean> <bean id="multipartResolver" class="org.springframework.web.multipart.commons.CommonsMultipartResolver"/> <bean id="jacksonMessageConverter" class="org.springframework.http.converter.json.MappingJacksonHttpMessageConverter"/> <bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter"> <property name="messageConverters"> <list> <ref bean="jacksonMessageConverter" /> </list> </property> </bean> <bean id="exceptionMessageAdapter" class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerExceptionResolver"> <property name="messageConverters"> <list>  <ref bean="jacksonMessageConverter" /> </list> </property> </bean> </code></pre> <p></p>
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<json><jsp><jquery><spring-mvc>
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jQuery post can't get entity object as json
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1. PO
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