在这篇文章中，我们将为您详细介绍创建本地和实例对象时出现javaStackOverflowError的内容，并且讨论关于java创建对象报错的相关问题。此外，我们还会涉及一些关于android-在活动
在这篇文章中，我们将为您详细介绍创建本地和实例对象时出现java StackOverflowError的内容，并且讨论关于java创建对象报错的相关问题。此外，我们还会涉及一些关于android-在活动组中添加新活动时出现java.lang.StackOverflowError、android开发java.lang.StackOverflowError、Eclipse 2020-03：验证 Maven 项目时出现 java.lang.StackOverflowError、fastjson序列化出现StackOverflowError的知识，以帮助您更全面地了解这个主题。
本文目录一览：- 创建本地和实例对象时出现java StackOverflowError（java创建对象报错）
- android-在活动组中添加新活动时出现java.lang.StackOverflowError
- android开发java.lang.StackOverflowError
- Eclipse 2020-03：验证 Maven 项目时出现 java.lang.StackOverflowError
- fastjson序列化出现StackOverflowError
创建本地和实例对象时出现java StackOverflowError（java创建对象报错）
嗨，有人可以向我解释一下为什么这个代码片段给我带来StackOverflowError的问题，如果您能解释instanceObj初始化并调用ObjectTest构造函数和java.lang.Object构造函数时发生的情况，我将非常感谢。在我看来，ObjectTest构造函数一遍又一遍地循环。但我不知道确切的原因吗？所以有什么建议…
public class ObjectTest { public ObjectTest() { } ObjectTest instanceObj = new ObjectTest(); public static void main(String[] args) { ObjectTest localObj = new ObjectTest(); }}答案1
小编典典让我们看看将执行什么：
main()创建一个新的实例ObjectTest- 的
ObjectTest类有一个字段instanceObj，其将包含一个ObjectTest instanceObj用新的in初始化ObjectTest- 转到步骤2
我认为您想要更多类似这样的东西：
public class ObjectTest { private static ObjectTest instanceObj; private ObjectTest() { } public static ObjectTest getInstance() { if (instanceObj != null) { instanceObj = new ObjectTest(); } return instanceObj; } public static void main(String[] args) { ObjectTest localObj = ObjectTest.getInstance(); }}或这个 ：
public class ObjectTest { private static final ObjectTest instanceObj = new ObjectTest(); private ObjectTest() { } public static ObjectTest getInstance() { return instanceObj; } public static void main(String[] args) { ObjectTest localObj = ObjectTest.getInstance(); }}这是单例模式。
android-在活动组中添加新活动时出现java.lang.StackOverflowError
我收到stackoverflow错误
我的布局结构如下
<tabactivity>
<tab1><Activity name="home">
<tab2><Activitygroup><activity name="XYZ">
<activity name="options">
<activity name="thankYou">
<tab3>
<tabactivity>
<tab3.1><Activitygroup><activities name="PQR">
<tab3.2><activity name="today">
<tab3.3><activity name="history">
<tab3.4><Activitygroup>
<activity name="reOrder"> from this I will open
<Activity name="options">
<tabactivity>
<tab4><Activitygroup><activities name="ABC">
<tab5><Activity name="setting">
<tabactivity>
我在tab3.4中遇到错误.
我在“活动组”中有一个活动,现在我在该活动组中添加新活动
下一步按钮单击tab3.4的活动组中的第一个活动.
我调试了它,并检查直到onResume()可以正常工作,但之后它会引发错误.
在出现错误之前,我还可以看到新活动.
另外,如果我打开另一个活动,它工作正常.当时它正在完美地工作.
堆栈跟踪
11-23 07:06:24.912: WARN/dalvikvm(1783): threadid=3: thread exiting with uncaught exception (group=0x4001b188)
11-23 07:06:24.912: ERROR/AndroidRuntime(1783): Uncaught handler: thread main exiting due to uncaught exception
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): java.lang.StackOverflowError
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.text.Styled.measureText(Styled.java:371)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.text.Layout.measureText(Layout.java:1601)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.text.Layout.getLineMax(Layout.java:655)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.text.Layout.getlinewidth(Layout.java:637)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.widget.TextView.getRightFadingEdgeStrength(TextView.java:6713)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.View.draw(View.java:6608)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.drawChild(ViewGroup.java:1531)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.View.draw(View.java:6538)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.drawChild(ViewGroup.java:1531)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.drawChild(ViewGroup.java:1529)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.View.draw(View.java:6641)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.widget.FrameLayout.draw(FrameLayout.java:352)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.drawChild(ViewGroup.java:1531)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.View.draw(View.java:6538)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.drawChild(ViewGroup.java:1531)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.View.draw(View.java:6538)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.drawChild(ViewGroup.java:1531)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.View.draw(View.java:6641)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.widget.FrameLayout.draw(FrameLayout.java:352)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.drawChild(ViewGroup.java:1531)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.drawChild(ViewGroup.java:1529)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.View.draw(View.java:6538)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.widget.FrameLayout.draw(FrameLayout.java:352)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.drawChild(ViewGroup.java:1531)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.drawChild(ViewGroup.java:1529)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.View.draw(View.java:6538)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.widget.FrameLayout.draw(FrameLayout.java:352)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.drawChild(ViewGroup.java:1531)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.drawChild(ViewGroup.java:1529)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.drawChild(ViewGroup.java:1529)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.drawChild(ViewGroup.java:1529)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.View.draw(View.java:6538)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.widget.FrameLayout.draw(FrameLayout.java:352)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.drawChild(ViewGroup.java:1531)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.View.draw(View.java:6538)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.widget.FrameLayout.draw(FrameLayout.java:352)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.drawChild(ViewGroup.java:1531)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.drawChild(ViewGroup.java:1529)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.drawChild(ViewGroup.java:1529)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.drawChild(ViewGroup.java:1529)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.View.draw(View.java:6538)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.widget.FrameLayout.draw(FrameLayout.java:352)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.drawChild(ViewGroup.java:1531)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.View.draw(View.java:6538)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.widget.FrameLayout.draw(FrameLayout.java:352)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.drawChild(ViewGroup.java:1531)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewGroup.dispatchDraw(ViewGroup.java:1258)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.View.draw(View.java:6538)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.widget.FrameLayout.draw(FrameLayout.java:352)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at com.android.internal.policy.impl.PhoneWindow$DecorView.draw(PhoneWindow.java:1830)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewRoot.draw(ViewRoot.java:1349)
11-23 07:06:24.943: ERROR/AndroidRuntime(1783): at android.view.ViewRoo
请帮我解决这个问题.
谢谢.
解决方法:
恐怕您需要任何其他解决方法,而不是将ActivityGroup嵌套在另一个ActivityGroup中
因为android不支持太多嵌套的ViewGroup可能是一些内存问题.
有时,这些选项卡在Emulator上可以完美运行,但在实际设备上部署时将异常显示StackOverflowException.
因此,最简单的方法是更改Activity流程(例如,将子ActivityGroup从父ActivityGroup中移出并在整个屏幕中显示)
For further see here, answer by Romain Guy
android开发java.lang.StackOverflowError
做android开发时，发现一个关于android退出时不能彻底关闭的问题，比如：一个程序里有多个线程，这样在退出程序的可能不能完全关闭，最后发现，只用finish()方法，有时候不能彻底退出，个人感觉还是要在适当的地方加上：System.exit(0);
原因有两点：
1.this.finish()当退出页面，也许还有其他activity存在，可能还有没有结束的线程，有很多没有释放的资源。
2.Java 的 exit(int code) 方法可以退出当前程序，终止当前正在运行的 Java 虚拟机。参数用作状态码；根据惯例，非 0 的状态码表示异常终止。该方法调用 Runtime 类中的 exit 方法。该方法永远不会正常返回。调用 System.exit(n) 实际上等效于调用：Runtime.getRuntime().exit(n)。
所以在推出页面的onDestroy()里面加上System.exit(0);可以解决第二次登陆java.lang.StackOverflowError异常。
Eclipse 2020-03：验证 Maven 项目时出现 java.lang.StackOverflowError
> at org.eclipse.json.provisonnal.com.eclipsesource.json.JsonParser.readObject(JsonParser.java:144)
at org.eclipse.json.provisonnal.com.eclipsesource.json.JsonParser.readValue(JsonParser.java:87)
!SESSION 2021-03-18 10:14:24.966 -----------------------------------------------
eclipse.buildId=4.15.0.I20200305-0155
java.version=1.8.0_282
java.vendor=Red Hat,Inc.
BootLoader constants: OS=linux,ARCH=x86_64,WS=gtk,NL=en_US
Framework arguments: -product org.eclipse.epp.package.jee.product
Command-line arguments: -os linux -ws gtk -arch x86_64 -product org.eclipse.epp.package.jee.product -clean
!ENTRY org.eclipse.jface 2 0 2021-03-18 10:28:19.469
!MESSAGE Keybinding conflicts occurred. They may interfere with normal accelerator operation.
!SUBENTRY 1 org.eclipse.jface 2 0 2021-03-18 10:28:19.469
!MESSAGE A conflict occurred for CTRL+SHIFT+T:
Binding(CTRL+SHIFT+T,ParameterizedCommand(Command(org.eclipse.jdt.ui.navigate.open.type,Open Type,Open a type in a Java editor,Category(org.eclipse.ui.category.navigate,Navigate,null,true),org.eclipse.ui.internal.WorkbenchHandlerServiceHandler@4bd39edc,null),org.eclipse.ui.defaultAcceleratorConfiguration,org.eclipse.ui.contexts.window,system)
Binding(CTRL+SHIFT+T,ParameterizedCommand(Command(org.eclipse.lsp4e.symbolinworkspace,Go to Symbol in Workspace,Category(org.eclipse.lsp4e.category,Language Servers,org.eclipse.ui.internal.WorkbenchHandlerServiceHandler@3ba50851,system)
!ENTRY org.eclipse.core.net 1 0 2021-03-18 10:28:25.383
!MESSAGE System property http.proxyHost is set to but should not be set.
!ENTRY org.eclipse.core.net 1 0 2021-03-18 10:28:25.384
!MESSAGE System property http.proxyPort is set to but should not be set.
!ENTRY org.eclipse.core.net 1 0 2021-03-18 10:28:25.385
!MESSAGE System property https.proxyHost is set to but should not be set.
!ENTRY org.eclipse.core.net 1 0 2021-03-18 10:28:25.385
!MESSAGE System property https.proxyPort is set to but should not be set.
!ENTRY com.gwtplugins.gwt.eclipse.wtp 1 1 2021-03-18 10:28:27.117
!MESSAGE GWT: GWT Facet startup
!ENTRY org.eclipse.m2e.logback.appender 2 0 2021-03-18 10:28:32.550
!MESSAGE The POM for cob.plugins.maven:schema-packager-plugin:jar:0.0.1-SNAPSHOT is missing,no dependency information available
!ENTRY org.eclipse.m2e.logback.appender 2 0 2021-03-18 10:28:32.553
!MESSAGE The POM for cob.plugins.maven:schema-packager-plugin:jar:0.0.1-SNAPSHOT is missing,no dependency information available
!ENTRY org.eclipse.m2e.logback.appender 2 0 2021-03-18 10:28:32.554
!MESSAGE The POM for cob.plugins.maven:schema-packager-plugin:jar:0.0.1-SNAPSHOT is missing,no dependency information available
!ENTRY com.gwtplugins.gdt.eclipse.suite.update 1 0 2021-03-18 10:28:35.441
!MESSAGE Sending POST request to Analytics: {cd1=org.eclipse.epp.package.jee.product,cd4=com.gwtplugins.eclipse.suite.v3.feature_0.0.0.0,cd3=3.13.700.v20200209-1624,t=event,cd6=GWT 2.8.1,v=1,ea=GWT_COMPILATION,an=GWT Eclipse Plugin,tid=UA-62291716-1,ec=com.gwtplugins.gdt.eclipse.suite.update,cd10=1599469239045,cid=1599469239045}
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fastjson序列化出现StackOverflowError
今天在一个web项目里开发功能，记录日志用到了fastjson的序列化，把类型为RetreatRecord的数据对象序列化后打印出来。结果出现StackOverflowError。先贴出来异常堆栈：
Exception in thread "main" java.lang.StackOverflowError
at com.alibaba.fastjson.serializer.JSONSerializer.getContext(JSONSerializer.java:109)
at com.alibaba.fastjson.serializer.JavaBeanSerializer.writeReference(JavaBeanSerializer.java:251)
at Serializer_1.write1(Unknown Source)
at Serializer_1.write(Unknown Source)
at com.alibaba.fastjson.serializer.JSONSerializer.writeWithFieldName(JSONSerializer.java:390)
//下面3行堆栈重复300多次
at Serializer_1.write1(Unknown Source)
at Serializer_1.write(Unknown Source)
at com.alibaba.fastjson.serializer.JSONSerializer.writeWithFieldName(JSONSerializer.java:390)
经排查原因，发现派生类RetreatRecord继承自DataEntity，DataEntity里有一个User currentUser字段。User也派生自DataEntity。currentUser的get方法如下：
public User getCurrentUser() {
if(null==currentUser){
currentUser=new User();
}
return currentUser;
}
问题就出现在了currentUser为null时给其初始化的这句上。
debug程序可见，fastjson包里JSONSerializer.java的如下方法被死循环执行，直到堆栈溢出。
// D:\workspace\m3\com\alibaba\fastjson\1.2.6\fastjson-1.2.6-sources.jar!\com\alibaba\fastjson\serializer\JSONSerializer.java
public final void writeWithFieldName(Object object, Object fieldName, Type fieldType, int fieldFeatures) {
try {
if (object == null) {
out.writeNull();
return;
}
Class<?> clazz = object.getClass();
ObjectSerializer writer = getObjectWriter(clazz);
writer.write(this, object, fieldName, fieldType, fieldFeatures);
} catch (IOException e) {
throw new JSONException(e.getMessage(), e);
}
}
分析：我们知道fastjson是基于流写入的。不难看出，在调用getCurrentUser时，因为currentUser是null，所以要给currentUser初始化，这时fastjson又要调用其getCurrentUser方法，然后又因为currentUser是null而不得不再给currentUser初始化，如此反复。。。，必然导致StackOverflow。
简化我遇到的情况，大家可以运行下面的代码来复现这个bug：
package fastjsonstackoverflow;
import java.io.Serializable;
public class MyEntity implements Serializable {
String id;
MyEntity currentUser;
public String getId() {
return id;
}
public void setId(String id) {
this.id = id;
}
/**
* 即使没有定义length字段，fastjson序列化不会出现异常
* @return
*/
public int getLength(){
return 0;
}
public MyEntity getCurrentUser() {
if(null==currentUser){
currentUser=new MyEntity();
}
return currentUser;
}
public void setCurrentUser(MyEntity currentUser) {
this.currentUser = currentUser;
}
}
package fastjsonstackoverflow;
import com.alibaba.fastjson.JSONObject;
public class MainTest {
public static void main(String[] args) {
MyEntity entity = new MyEntity();
// System.out.println("mydata:"+entity.getCurrentUser());
System.out.println("mydata:" + JSONObject.toJSONString(entity));
}
}
ps：今天通过查看fastjson源码，了解到java中的移位运算符>> <<，
<< : 左移运算符，num << 1,相当于num乘以2
>> : 右移运算符，num >> 1,相当于num除以2
在此做记录。
关于创建本地和实例对象时出现java StackOverflowError和java创建对象报错的问题我们已经讲解完毕，感谢您的阅读，如果还想了解更多关于android-在活动组中添加新活动时出现java.lang.StackOverflowError、android开发java.lang.StackOverflowError、Eclipse 2020-03：验证 Maven 项目时出现 java.lang.StackOverflowError、fastjson序列化出现StackOverflowError等相关内容，可以在本站寻找。
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