java.lang.IllegalArgumentException：类 java.text.DecimalFormat 声明了多个名为 maximumIntegerDigits 的 JSON 字段

Question

我正在对 servlet 进行 ajax 调用。我希望将数据从 servlet 传回 jsp：

PrintWriter out = response.getWriter();
    String isbn = (String) request.getParameter("isbn");
    BookDetail bd = new BookDetail();
    if(bd.ISBNFound(isbn)){
    ArrayList<KitapData> Books = bd.LoadBooksByISBN(isbn);

    Gson gson = new Gson();
    String json = gson.toJson(Books);
    response.setContentType("application/json");
    System.out.print(json);      
    out.print(json);
}

我在类路径中添加了 GSon.jar。但是我遇到了一些错误：完整列表如下：我在这里缺少什么？

WARNING:   StandardWrapperValve[Book_CheckISBN]: Servlet.service() for servlet Book_CheckISBN threw exception
java.lang.IllegalArgumentException: class java.text.DecimalFormat declares multiple JSON fields named maximumIntegerDigits
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:122)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:72)
    at com.google.gson.Gson.getAdapter(Gson.java:356)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory$1.<init>(ReflectiveTypeAdapterFactory.java:82)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.createBoundField(ReflectiveTypeAdapterFactory.java:81)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.getBoundFields(ReflectiveTypeAdapterFactory.java:118)
    at com.google.gson.internal.bind.ReflectiveTypeAdapterFactory.create(ReflectiveTypeAdapterFactory.java:72)
    at com.google.gson.Gson.getAdapter(Gson.java:356)
    at com.google.gson.internal.bind.TypeAdapterRuntimeTypeWrapper.write(TypeAdapterRuntimeTypeWrapper.java:55)
    at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:96)
    at com.google.gson.internal.bind.CollectionTypeAdapterFactory$Adapter.write(CollectionTypeAdapterFactory.java:60)
    at com.google.gson.Gson.toJson(Gson.java:593)
    at com.google.gson.Gson.toJson(Gson.java:572)
    at com.google.gson.Gson.toJson(Gson.java:527)
    at com.google.gson.Gson.toJson(Gson.java:507)
    at book.ctrl.Book_CheckISBN.doPost(Book_CheckISBN.java:41)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
    at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1682)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:318)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:160)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:734)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:673)
    at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:99)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:174)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:415)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:282)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$HttpHandlerCallable.call(ContainerMapper.java:459)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:167)
    at org.glassfish.grizzly.http.server.HttpHandler.runService(HttpHandler.java:201)
    at org.glassfish.grizzly.http.server.HttpHandler.doHandle(HttpHandler.java:175)
    at org.glassfish.grizzly.http.server.HttpServerFilter.handleRead(HttpServerFilter.java:235)
    at org.glassfish.grizzly.filterchain.ExecutorResolver$9.execute(ExecutorResolver.java:119)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeFilter(DefaultFilterChain.java:284)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.executeChainPart(DefaultFilterChain.java:201)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.execute(DefaultFilterChain.java:133)
    at org.glassfish.grizzly.filterchain.DefaultFilterChain.process(DefaultFilterChain.java:112)
    at org.glassfish.grizzly.ProcessorExecutor.execute(ProcessorExecutor.java:77)
    at org.glassfish.grizzly.nio.transport.TCPNIOTransport.fireIOEvent(TCPNIOTransport.java:561)
    at org.glassfish.grizzly.strategies.AbstractIOStrategy.fireIOEvent(AbstractIOStrategy.java:112)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.run0(WorkerThreadIOStrategy.java:117)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy.access$100(WorkerThreadIOStrategy.java:56)
    at org.glassfish.grizzly.strategies.WorkerThreadIOStrategy$WorkerThreadRunnable.run(WorkerThreadIOStrategy.java:137)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:565)
    at org.glassfish.grizzly.threadpool.AbstractThreadPool$Worker.run(AbstractThreadPool.java:545)
    at java.lang.Thread.run(Thread.java:722)

Answer 1

我的情况是 DO 中的 SimpleDateFormat 字段导致错误，
添加后 transient给它，问题解决了

Answer 2

您实际上不太可能将DecimalFormat 类型的字段序列化为 JSON。如果您可以修改 KitapData 类，您可以考虑删除该字段，或将其设为 transient，这将告诉 Gson（和其他序列化程序）忽略该字段。

private transient DecimalFormat whateverTheFieldIsCalled;

如果您无法修改 KitapData 类，还有其他方法可以告诉 Gson 从序列化中排除该字段 - 例如参见 Gson: How to exclude specific fields from Serialization without annotations

Answer 3

你的班级KitapData 在某处有一个DecimalFormat 属性。 Gson 失败了，因为它不是标准的 Java 类型，它具有内置支持，例如 String、Number、Boolean、Date、List 等。

您需要删除 DecimalFormat 属性。不仅因为 Gson 在没有 registered a type adapter 的情况下无法自动消化它，还因为它不可能代表“bean 属性”并且它本质上是紧耦合的。此外，NumberFormat 就像DateFormat 所有朋友不是线程安全的。将其作为 bean 属性表明它可以在多个线程之间共享。这可能会导致格式损坏甚至​​异常。

也许您只想存储格式模式或其他相关属性。在这种情况下，请将它们存储为 String、Integer 等，并确保代码始终基于这些“松散”属性在方法本地范围内创建全新的 DecimalFormat 实例。