添加函数导致Java堆空间错误

无论何时从xhtml页面调用getFriendList函数，都会出现异常。页面继续加载，然后我停止浏览器。我得到给定的斯塔克斯特拉斯。它告诉我第78行friends.addfriend；有一个错误。我想我的语法有问题。如果有人指出错误，那会很有帮助

1这是我的FriendBean，它是请求范围

package com.bean;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import javax.faces.context.FacesContext;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.Persistence;
import javax.persistence.Query;
import javax.servlet.http.HttpSession;
import com.entity.Friend;
import com.entity.User;

public class FriendBean {

    Friend friend;
    private EntityManager em;
    public FriendBean(){
        friend = new Friend();
        EntityManagerFactory emf=Persistence.createEntityManagerFactory("FreeBird");
         em =emf.createEntityManager();
    }
    public Friend getFriend() {
        return friend;
    }
    public void setFriend(Friend friend) {
        this.friend = friend;
    }
    public List<Friend> getFriendRequestList(){
        FacesContext context = FacesContext.getCurrentInstance();
        HttpSession session = (HttpSession) context.getExternalContext().getSession(true);
        User user=(User) session.getAttribute("userdet");
        Query query = em.createQuery("SELECT f FROM Friend f WHERE f.email='"+user.getEmail()+"' AND f.status=0",Friend.class);
          List<Friend> results =query.getResultList();
          return results;


    }
    public String friendAccept(String friendRequestId){

        System.out.println("friend accept called...");
        Friend f=em.find(Friend.class,Integer.parseInt(friendRequestId));
        f.setStatus(1);
        em.getTransaction().begin();
        em.persist(f);
        em.getTransaction().commit();
        Friend viceversa=new Friend();
        viceversa.setEmail(f.getFriendEmail());
        viceversa.setFriendEmail(f.getEmail());
        viceversa.setStatus(1);
        em.getTransaction().begin();
        em.persist(viceversa);
        em.getTransaction().commit();
        return "success";

    }
    public String friendReject(String friendRequestId){
        System.out.println("friend reject called..");
        Friend f = em.find(Friend.class,Integer.parseInt(friendRequestId));
        em.getTransaction().begin();
        em.remove(f);
        em.getTransaction().commit();
        return "success";
    }
    public List<User> getFriendList(){

        FacesContext context = FacesContext.getCurrentInstance();
        HttpSession session = (HttpSession) context.getExternalContext().getSession(true);
        User user=(User) session.getAttribute("userdet");
        Query query = em.createQuery("SELECT f FROM Friend f WHERE f.email='"+user.getEmail()+"' AND f.status=1",Friend.class);
         List<Friend> results =query.getResultList();
         ArrayList<User> friends = new ArrayList<User>();

         while(results.listIterator().hasNext()){
             User friend =em.find(User.class,results.listIterator().next().getFriendEmail());
             friends.add(friend);
         }
          return friends;

    }
}

---

很明显，您遇到了一个问题，您的Tomcat服务器实例没有为JVM堆空间分配足够的内存。当分配的堆空间被完全占用时，将抛出OutOfMemoryError

您可以通过Tomcat Windows应用程序分配更多，也可以在catalina.bat或catalina.sh中进行设置

例如：

设置CATALINA_选项=-Xms512m-Xmx512m

---

很明显，您遇到了一个问题，您的Tomcat服务器实例没有为JVM堆空间分配足够的内存。当分配的堆空间被完全占用时，将抛出OutOfMemoryError

您可以通过Tomcat Windows应用程序分配更多，也可以在catalina.bat或catalina.sh中进行设置

例如：

设置CATALINA_选项=-Xms512m-Xmx512m

---

我同意这一点。不过，作为旁注，您的SQL语句正在向SQL注入打开您的应用程序。。。尖沙咀尖沙咀..：最好使用PreparedStatement并向其添加参数。请参见此处的操作方法：另外还有一些SQL注入的背景知识：@DomenicD。很好的发现，但是你应该把它作为一个注释添加到问题中，以便OP知道。在我的回答中评论这一点意味着永远不会通知此人：我同意这一点。不过，作为旁注，您的SQL语句正在向SQL注入打开您的应用程序。。。尖沙咀尖沙咀..：最好使用PreparedStatement并向其添加参数。请参见此处的操作方法：另外还有一些SQL注入的背景知识：@DomenicD。很好的发现，但是你应该把它作为一个注释添加到问题中，以便OP知道。在我的回答中评论这一点意味着这个人永远不会得到通知：您的SQL语句正在打开您的应用程序进行SQL注入。。。尖沙咀尖沙咀..：最好使用PreparedStatement并向其添加参数。这里可以看到如何做到这一点：docs.oracle.com/javase/tutorial/jdbc/basics/prepared.html还有一些SQL注入的背景知识：owasp.org/index.php/provention_SQL_Injection_in_Java@DomenicD. 我正要写它：，很好。另一件事是这行代码：HttpSession session=HttpSession context.getExternalContext.getsessionrue；表示：如果会话不存在，则创建新会话。我想那不是你想要的。因此，请改用getSessionfalse-如果存在会话，则获取它，否则不要创建new并获取null。您的SQL语句正在打开应用程序进行SQL注入。。。尖沙咀尖沙咀..：最好使用PreparedStatement并向其添加参数。这里可以看到如何做到这一点：docs.oracle.com/javase/tutorial/jdbc/basics/prepared.html还有一些SQL注入的背景知识：owasp.org/index.php/provention_SQL_Injection_in_Java@DomenicD. 我正要写它：，很好。另一件事是这行代码：HttpSession session=HttpSession context.getExternalContext.getsessionrue；表示：如果会话不存在，则创建新会话。我想那不是你想要的。因此，请改用getSessionfalse-如果会话存在，则获取它，否则不要创建new并获取null。

SEVERE: Error Rendering View[/Home.xhtml]
javax.el.ELException: /Home.xhtml @146,59 value="#{friendBean.friendList}": java.lang.OutOfMemoryError: Java heap space
    at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:114)
    at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)
    at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182)
    at javax.faces.component.UIData.getValue(UIData.java:731)
    at javax.faces.component.UIData.getDataModel(UIData.java:1798)
    at javax.faces.component.UIData.setRowIndexWithoutRowStatePreserved(UIData.java:484)
    at javax.faces.component.UIData.setRowIndex(UIData.java:473)
    at com.sun.faces.renderkit.html_basic.TableRenderer.encodeBegin(TableRenderer.java:81)
    at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:820)
    at javax.faces.component.UIData.encodeBegin(UIData.java:1118)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1755)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1760)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1760)
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:402)
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)
    at com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:139)
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:594)
    at org.apache.catalina.core.StandardWrapper.service(StandardWrapper.java:1550)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:343)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
    at org.primefaces.webapp.filter.FileUploadFilter.doFilter(FileUploadFilter.java:79)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:256)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:217)
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:279)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
    at org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:655)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:595)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:161)
    at org.apache.catalina.connector.CoyoteAdapter.doService(CoyoteAdapter.java:331)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:231)
    at com.sun.enterprise.v3.services.impl.ContainerMapper$AdapterCallable.call(ContainerMapper.java:317)
    at com.sun.enterprise.v3.services.impl.ContainerMapper.service(ContainerMapper.java:195)
    at com.sun.grizzly.http.ProcessorTask.invokeAdapter(ProcessorTask.java:860)
    at com.sun.grizzly.http.ProcessorTask.doProcess(ProcessorTask.java:757)
    at com.sun.grizzly.http.ProcessorTask.process(ProcessorTask.java:1056)
    at com.sun.grizzly.http.DefaultProtocolFilter.execute(DefaultProtocolFilter.java:229)
    at com.sun.grizzly.DefaultProtocolChain.executeProtocolFilter(DefaultProtocolChain.java:137)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:104)
    at com.sun.grizzly.DefaultProtocolChain.execute(DefaultProtocolChain.java:90)
    at com.sun.grizzly.http.HttpProtocolChain.execute(HttpProtocolChain.java:79)
    at com.sun.grizzly.ProtocolChainContextTask.doCall(ProtocolChainContextTask.java:54)
    at com.sun.grizzly.SelectionKeyContextTask.call(SelectionKeyContextTask.java:59)
    at com.sun.grizzly.ContextTask.run(ContextTask.java:71)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.doWork(AbstractThreadPool.java:532)
    at com.sun.grizzly.util.AbstractThreadPool$Worker.run(AbstractThreadPool.java:513)
    at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.OutOfMemoryError: Java heap space
    at java.util.Arrays.copyOf(Arrays.java:2245)
    at java.util.Arrays.copyOf(Arrays.java:2219)
    at java.util.ArrayList.grow(ArrayList.java:213)
    at java.util.ArrayList.ensureCapacityInternal(ArrayList.java:187)
    at java.util.ArrayList.add(ArrayList.java:411)
    at com.bean.FriendBean.getFriendList(FriendBean.java:78)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at javax.el.BeanELResolver.getValue(BeanELResolver.java:363)
    at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)
    at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)
    at com.sun.el.parser.AstValue.getValue(AstValue.java:138)
    at com.sun.el.parser.AstValue.getValue(AstValue.java:183)
    at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:224)
    at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)
    at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)
    at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182)
    at javax.faces.component.UIData.getValue(UIData.java:731)
    at javax.faces.component.UIData.getDataModel(UIData.java:1798)
    at javax.faces.component.UIData.setRowIndexWithoutRowStatePreserved(UIData.java:484)
    at javax.faces.component.UIData.setRowIndex(UIData.java:473)
    at com.sun.faces.renderkit.html_basic.TableRenderer.encodeBegin(TableRenderer.java:81)
    at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:820)
    at javax.faces.component.UIData.encodeBegin(UIData.java:1118)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1755)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1760)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1760)
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:402)
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)

WARNING: StandardWrapperValve[Faces Servlet]: PWC1406: Servlet.service() for servlet Faces Servlet threw exception
java.lang.OutOfMemoryError: Java heap space
    at java.util.Arrays.copyOf(Arrays.java:2245)
    at java.util.Arrays.copyOf(Arrays.java:2219)
    at java.util.ArrayList.grow(ArrayList.java:213)
    at java.util.ArrayList.ensureCapacityInternal(ArrayList.java:187)
    at java.util.ArrayList.add(ArrayList.java:411)
    at com.bean.FriendBean.getFriendList(FriendBean.java:78)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at javax.el.BeanELResolver.getValue(BeanELResolver.java:363)
    at com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176)
    at com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203)
    at com.sun.el.parser.AstValue.getValue(AstValue.java:138)
    at com.sun.el.parser.AstValue.getValue(AstValue.java:183)
    at com.sun.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:224)
    at com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109)
    at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194)
    at javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182)
    at javax.faces.component.UIData.getValue(UIData.java:731)
    at javax.faces.component.UIData.getDataModel(UIData.java:1798)
    at javax.faces.component.UIData.setRowIndexWithoutRowStatePreserved(UIData.java:484)
    at javax.faces.component.UIData.setRowIndex(UIData.java:473)
    at com.sun.faces.renderkit.html_basic.TableRenderer.encodeBegin(TableRenderer.java:81)
    at javax.faces.component.UIComponentBase.encodeBegin(UIComponentBase.java:820)
    at javax.faces.component.UIData.encodeBegin(UIData.java:1118)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1755)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1760)
    at javax.faces.component.UIComponent.encodeAll(UIComponent.java:1760)
    at com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:402)
    at com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:131)
    at com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:121)