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我的应用程序计算存储在复杂数据结构中的 9 个统计信息,如 HashMap<String, TreeMap<String, Integer>>
甚至更复杂。每个统计信息都实现接口(interface) IStatistic。结果存储在 List<IStatistic>
中它的大小(对于最大的例子)是 3.5MB(我已经手动序列化它并把它放到文件中)。当我有时向客户端发送结果时(通常当数据大小超过 1.5MB 时,即当小于某个限制时不会发生异常)发生奇怪的异常并且它永远不会在同一个地方..
我已经阅读并尝试了针对我在此处和 GWT 官方页面上发现的问题的所有类似解决方案,例如:
" https://developers.google.com/web-toolkit/doc/latest/tutorial/RPC http://stackoverflow.com/questions/2122798/gwt-occasional-com-google-gwt-user-client-rpc-serializationexception did you check http://code.google.com/webtoolkit/doc/latest/tutorial/RPC.html#serialize the article says: It has a default (zero argument) constructor with any access modifier (e.g. private Foo(){} will work) I'm allways forgetting zeroargument const. when I am making a serializable object :D "
但没有任何帮助。还尝试调试它,但它在 GWT 源代码的某处出现故障,我看不到源代码。有趣的是,对于较小的数据样本,一切都很顺利。
我正在使用 GWT 2.4.0。没有应用引擎。
有没有人有类似的问题或有一些建议来处理这个问题?
Here are some example exceptions:
FIRST EXAMPLE:
com.google.gwt.user.client.rpc.IncompatibleRemoteServiceException: The response could not be deserialized
at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:221)
at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:287)
at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:395)
at sun.reflect.GeneratedMethodAccessor52.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:337)
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:218)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:213)
at sun.reflect.GeneratedMethodAccessor32.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:292)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:546)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363)
at java.lang.Thread.run(Unknown Source)
Caused by: com.google.gwt.user.client.rpc.SerializationException: 2AS (6)
at com.google.gwt.user.client.rpc.impl.SerializerBase.getTypeHandler(SerializerBase.java:153)
at com.google.gwt.user.client.rpc.impl.SerializerBase.instantiate(SerializerBase.java:114)
at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.deserialize(ClientSerializationStreamReader.java:111)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:119)
at com.google.gwt.user.client.rpc.core.java.util.Map_CustomFieldSerializerBase.deserialize(Map_CustomFieldSerializerBase.java:38)
at com.google.gwt.user.client.rpc.core.java.util.TreeMap_CustomFieldSerializer.deserialize(TreeMap_CustomFieldSerializer.java:36)
at com.google.gwt.user.client.rpc.core.java.util.TreeMap_FieldSerializer.deserial(TreeMap_FieldSerializer.java:15)
at com.google.gwt.user.client.rpc.impl.SerializerBase.deserialize(SerializerBase.java:95)
at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.deserialize(ClientSerializationStreamReader.java:113)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:119)
at com.google.gwt.user.client.rpc.core.java.util.Map_CustomFieldSerializerBase.deserialize(Map_CustomFieldSerializerBase.java:39)
at com.google.gwt.user.client.rpc.core.java.util.HashMap_CustomFieldSerializer.deserialize(HashMap_CustomFieldSerializer.java:34)
at com.google.gwt.user.client.rpc.core.java.util.HashMap_FieldSerializer.deserial(HashMap_FieldSerializer.java:19)
at com.google.gwt.user.client.rpc.impl.SerializerBase.deserialize(SerializerBase.java:95)
at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.deserialize(ClientSerializationStreamReader.java:113)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:119)
at hr.fer.zesoi.metals.shared.statistic.result.StatisticM1Result_FieldSerializer.deserialize(StatisticM1Result_FieldSerializer.java:29)
at hr.fer.zesoi.metals.shared.statistic.result.StatisticM1Result_FieldSerializer.deserial(StatisticM1Result_FieldSerializer.java:51)
at com.google.gwt.user.client.rpc.impl.SerializerBase.deserialize(SerializerBase.java:95)
at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.deserialize(ClientSerializationStreamReader.java:113)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:119)
at com.google.gwt.user.client.rpc.core.java.util.Collection_CustomFieldSerializerBase.deserialize(Collection_CustomFieldSerializerBase.java:34)
at com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializer.deserialize(ArrayList_CustomFieldSerializer.java:34)
at com.google.gwt.user.client.rpc.core.java.util.ArrayList_FieldSerializer.deserial(ArrayList_FieldSerializer.java:19)
at com.google.gwt.user.client.rpc.impl.SerializerBase.deserialize(SerializerBase.java:95)
at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.deserialize(ClientSerializationStreamReader.java:113)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:119)
at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter$ResponseReader$8.read(RequestCallbackAdapter.java:106)
at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:214)
... 26 more
SECOND EXAMPLE:
com.google.gwt.dev.shell.HostedModeException: Something other than an int was returned from JSNI method '@com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader::readInt()': JS value of type string, expected int
at com.google.gwt.dev.shell.JsValueGlue.getIntRange(JsValueGlue.java:266)
at com.google.gwt.dev.shell.JsValueGlue.get(JsValueGlue.java:144)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeInt(ModuleSpace.java:247)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeInt(JavaScriptHost.java:75)
at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.readInt(ClientSerializationStreamReader.java)
at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.readString(ClientSerializationStreamReader.java:104)
at com.google.gwt.user.client.rpc.core.java.lang.String_CustomFieldSerializer.instantiate(String_CustomFieldSerializer.java:37)
at com.google.gwt.user.client.rpc.core.java.lang.String_FieldSerializer.create(String_FieldSerializer.java:11)
at com.google.gwt.user.client.rpc.impl.SerializerBase.instantiate(SerializerBase.java:115)
at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.deserialize(ClientSerializationStreamReader.java:111)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:119)
at com.google.gwt.user.client.rpc.core.java.util.Collection_CustomFieldSerializerBase.deserialize(Collection_CustomFieldSerializerBase.java:34)
at com.google.gwt.user.client.rpc.core.java.util.TreeSet_CustomFieldSerializer.deserialize(TreeSet_CustomFieldSerializer.java:36)
at com.google.gwt.user.client.rpc.core.java.util.TreeSet_FieldSerializer.deserial(TreeSet_FieldSerializer.java:15)
at com.google.gwt.user.client.rpc.impl.SerializerBase.deserialize(SerializerBase.java:95)
at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.deserialize(ClientSerializationStreamReader.java:113)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:119)
at com.google.gwt.user.client.rpc.core.java.util.Map_CustomFieldSerializerBase.deserialize(Map_CustomFieldSerializerBase.java:39)
at com.google.gwt.user.client.rpc.core.java.util.HashMap_CustomFieldSerializer.deserialize(HashMap_CustomFieldSerializer.java:34)
at com.google.gwt.user.client.rpc.core.java.util.HashMap_FieldSerializer.deserial(HashMap_FieldSerializer.java:19)
at com.google.gwt.user.client.rpc.impl.SerializerBase.deserialize(SerializerBase.java:95)
at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.deserialize(ClientSerializationStreamReader.java:113)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:119)
at hr.fer.zesoi.metals.shared.statistic.IStatisticResult_FieldSerializer.deserialize(IStatisticResult_FieldSerializer.java:13)
at hr.fer.zesoi.metals.shared.statistic.result.StatisticM2Result_FieldSerializer.deserialize(StatisticM2Result_FieldSerializer.java:22)
at hr.fer.zesoi.metals.shared.statistic.result.StatisticM2Result_FieldSerializer.deserial(StatisticM2Result_FieldSerializer.java:40)
at com.google.gwt.user.client.rpc.impl.SerializerBase.deserialize(SerializerBase.java:95)
at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.deserialize(ClientSerializationStreamReader.java:113)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:119)
at com.google.gwt.user.client.rpc.core.java.util.Collection_CustomFieldSerializerBase.deserialize(Collection_CustomFieldSerializerBase.java:34)
at com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializer.deserialize(ArrayList_CustomFieldSerializer.java:34)
at com.google.gwt.user.client.rpc.core.java.util.ArrayList_FieldSerializer.deserial(ArrayList_FieldSerializer.java:19)
at com.google.gwt.user.client.rpc.impl.SerializerBase.deserialize(SerializerBase.java:95)
at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.deserialize(ClientSerializationStreamReader.java:113)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:119)
at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter$ResponseReader$8.read(RequestCallbackAdapter.java:106)
at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:214)
at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:287)
at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:395)
at sun.reflect.GeneratedMethodAccessor37.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:337)
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:218)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:213)
at sun.reflect.GeneratedMethodAccessor32.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:292)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:546)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363)
at java.lang.Thread.run(Unknown Source)
THIRD EXAMPLE:
java.lang.NullPointerException
at java.util.TreeMap.put(Unknown Source)
at java.util.TreeSet.add(Unknown Source)
at com.google.gwt.user.client.rpc.core.java.util.Collection_CustomFieldSerializerBase.deserialize(Collection_CustomFieldSerializerBase.java:35)
at com.google.gwt.user.client.rpc.core.java.util.TreeSet_CustomFieldSerializer.deserialize(TreeSet_CustomFieldSerializer.java:36)
at com.google.gwt.user.client.rpc.core.java.util.TreeSet_FieldSerializer.deserial(TreeSet_FieldSerializer.java:15)
at com.google.gwt.user.client.rpc.impl.SerializerBase.deserialize(SerializerBase.java:95)
at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.deserialize(ClientSerializationStreamReader.java:113)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:119)
at com.google.gwt.user.client.rpc.core.java.util.Map_CustomFieldSerializerBase.deserialize(Map_CustomFieldSerializerBase.java:39)
at com.google.gwt.user.client.rpc.core.java.util.HashMap_CustomFieldSerializer.deserialize(HashMap_CustomFieldSerializer.java:34)
at com.google.gwt.user.client.rpc.core.java.util.HashMap_FieldSerializer.deserial(HashMap_FieldSerializer.java:19)
at com.google.gwt.user.client.rpc.impl.SerializerBase.deserialize(SerializerBase.java:95)
at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.deserialize(ClientSerializationStreamReader.java:113)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:119)
at hr.fer.zesoi.metals.shared.statistic.IStatisticResult_FieldSerializer.deserialize(IStatisticResult_FieldSerializer.java:13)
at hr.fer.zesoi.metals.shared.statistic.result.StatisticM4Result_FieldSerializer.deserialize(StatisticM4Result_FieldSerializer.java:44)
at hr.fer.zesoi.metals.shared.statistic.result.StatisticM4Result_FieldSerializer.deserial(StatisticM4Result_FieldSerializer.java:66)
at com.google.gwt.user.client.rpc.impl.SerializerBase.deserialize(SerializerBase.java:95)
at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.deserialize(ClientSerializationStreamReader.java:113)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:119)
at com.google.gwt.user.client.rpc.core.java.util.Collection_CustomFieldSerializerBase.deserialize(Collection_CustomFieldSerializerBase.java:34)
at com.google.gwt.user.client.rpc.core.java.util.ArrayList_CustomFieldSerializer.deserialize(ArrayList_CustomFieldSerializer.java:34)
at com.google.gwt.user.client.rpc.core.java.util.ArrayList_FieldSerializer.deserial(ArrayList_FieldSerializer.java:19)
at com.google.gwt.user.client.rpc.impl.SerializerBase.deserialize(SerializerBase.java:95)
at com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader.deserialize(ClientSerializationStreamReader.java:113)
at com.google.gwt.user.client.rpc.impl.AbstractSerializationStreamReader.readObject(AbstractSerializationStreamReader.java:119)
at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter$ResponseReader$8.read(RequestCallbackAdapter.java:106)
at com.google.gwt.user.client.rpc.impl.RequestCallbackAdapter.onResponseReceived(RequestCallbackAdapter.java:214)
at com.google.gwt.http.client.Request.fireOnResponseReceived(Request.java:287)
at com.google.gwt.http.client.RequestBuilder$1.onReadyStateChange(RequestBuilder.java:395)
at sun.reflect.GeneratedMethodAccessor47.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:337)
at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:218)
at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136)
at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:561)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:269)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91)
at com.google.gwt.core.client.impl.Impl.apply(Impl.java)
at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:213)
at sun.reflect.GeneratedMethodAccessor42.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103)
at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71)
at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172)
at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:292)
at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:546)
at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:363)
at java.lang.Thread.run(Unknown Source)
最佳答案
对于第一个错误,这几乎可以肯定表明您的服务器和客户端不同步,并且对可以序列化和反序列化的内容有不同的看法。清除浏览器缓存,或确保服务器运行与客户端相同的代码(如果从 google 的应用引擎服务器运行,则重新部署到服务器,如果在本地运行,则重新启动)。从字符串“2AS
”看来,您可能正在混淆类型名称 - 考虑禁用该功能,直到您确定解决此问题。
第二个错误:
com.google.gwt.dev.shell.HostedModeException: Something other than an int was returned from JSNI method '@com.google.gwt.user.client.rpc.impl.ClientSerializationStreamReader::readInt()': JS value of type string, expected int
at com.google.gwt.dev.shell.JsValueGlue.getIntRange(JsValueGlue.java:266)
at com.google.gwt.dev.shell.JsValueGlue.get(JsValueGlue.java:144)
at com.google.gwt.dev.shell.ModuleSpace.invokeNativeInt(ModuleSpace.java:247)
at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeInt(JavaScriptHost.java:75)
幸运的是,这是 Chrome+Dev 模式下的一个已知问题。在其他浏览器中不会出现,在web模式的Chrome中也不会出现。使用不同的浏览器是避免这种情况的最简单方法 - 任何运行大量 JSNI 代码的代码(例如任何 RPC 代码)最终都会遇到这种情况。
java.lang.NullPointerException
at java.util.TreeMap.put(Unknown Source)
at java.util.TreeSet.add(Unknown Source)
at com.google.gwt.user.client.rpc.core.java.util.Collection_CustomFieldSerializerBase.deserialize(Collection_CustomFieldSerializerBase.java:35)
at com.google.gwt.user.client.rpc.core.java.util.TreeSet_CustomFieldSerializer.deserialize(TreeSet_CustomFieldSerializer.java:36)
at com.google.gwt.user.client.rpc.core.java.util.TreeSet_FieldSerializer.deserial(TreeSet_FieldSerializer.java:15)
这发生在这段代码中:
@SuppressWarnings("unchecked")
public final class Collection_CustomFieldSerializerBase {
public static void deserialize(SerializationStreamReader streamReader,
Collection instance) throws SerializationException {
int size = streamReader.readInt();
for (int i = 0; i < size; ++i) {
Object obj = streamReader.readObject();
instance.add(obj); //line 35
}
}
这表明 obj
在该行是空的,并且您可能正在向 TreeSet 添加一些空对象(在我想象的 TreeMap 中)。可能值得在该类中设置一个断点,条件是 obj 为 null 以确定这是否是原因,如果是,如何确定它。
关于java - GWT 奇怪的序列化异常,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10361839/
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以下是 Joshua 的 Effective Java 的摘录: If you do synchronize your class internally, you can use various te
在这里工作时,我们有一个框向业务合作伙伴提供 XML 提要。对我们的提要的请求是通过指定查询字符串参数和值来定制的。其中一些参数是必需的,但很多不是。 例如,我们要求所有请求都指定一个 GUID 来标
我有 3 个缓冲区,其中包含在 32 位处理器上运行的 R、G、B 位数据。 我需要按以下方式组合三个字节: R[0] = 0b r1r2r3r4r5r6r7r8 G[0] = 0b g1g2g3g4
我最近发现了关于如何使用 History.js、jQuery 和 ScrollTo 通过 HTML5 History API 对网站进行 Ajax 化的要点:https://github.com/br
我们有一个 Spring Boot 应用程序,由于集成需要,它变得越来越复杂——比如在你这样做之后发送一封电子邮件,或者在你之后广播一条 jms 消息等等。在寻找一些更高级别的抽象时,我遇到了 apa
我正在尝试首次实施Google Pay。我面临如何指定gateway和gatewayMarchantId的挑战。 我所拥有的是google console帐户,不知道在哪里可以找到此信息。 priva
昨天下午 3 点左右,我为两个想要从一个 Azure 帐户转移到另一个帐户的网站设置了 awverify 记录。到当天结束时,Azure 仍然不允许我添加域,所以我赌了一把,将域和 www 子域重新指
我正在使用terms facet在elasticsearch服务器中获取顶级terms。现在,我的标签"indian-government"不被视为一个标签。将其视为"indian" "governm
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