java - How to save Object-Lists with ObjectOutputStream and how to read these in? -
i've list "group" objects:
protected static arraylist<gruppe> groups=new arraylist<gruppe>(); now want save whole list.
oos.writeobject(groups); is correct?
or save each separately?
like this:
for(gruppe g:groups){ oos.writeobject(g);//geht nicht..? } and how read in? objectinputstream
groups=(arraylist<gruppe>) ois.readobject(); or seperatly again?
groups=new arraylist<gruppe>(); gruppe k=null; while ((k=(gruppe) ois.readobject()) != null) { groups.add(k); } header gruppe:
public class gruppe extends jpanel implements comparable<gruppe>, serializable{
save: stacktrace in first way
java.io.notserializableexception: com.sun.java.swing.plaf.windows.xpstyle @ java.io.objectoutputstream.writeobject0(unknown source) @ java.io.objectoutputstream.defaultwritefields(unknown source) @ java.io.objectoutputstream.writeserialdata(unknown source) @ java.io.objectoutputstream.writeordinaryobject(unknown source) @ java.io.objectoutputstream.writeobject0(unknown source) @ java.io.objectoutputstream.defaultwritefields(unknown source) @ java.io.objectoutputstream.writeserialdata(unknown source) @ java.io.objectoutputstream.writeordinaryobject(unknown source) @ java.io.objectoutputstream.writeobject0(unknown source) @ java.io.objectoutputstream.defaultwritefields(unknown source) @ java.io.objectoutputstream.defaultwriteobject(unknown source) @ javax.swing.jcomponent.writeobject(unknown source) @ sun.reflect.generatedmethodaccessor10.invoke(unknown source) @ sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source) @ java.lang.reflect.method.invoke(unknown source) @ java.io.objectstreamclass.invokewriteobject(unknown source) @ java.io.objectoutputstream.writeserialdata(unknown source) @ java.io.objectoutputstream.writeordinaryobject(unknown source) @ java.io.objectoutputstream.writeobject0(unknown source) @ java.io.objectoutputstream.writearray(unknown source) @ java.io.objectoutputstream.writeobject0(unknown source) @ java.io.objectoutputstream.access$300(unknown source) @ java.io.objectoutputstream$putfieldimpl.writefields(unknown source) @ java.io.objectoutputstream.writefields(unknown source) @ java.awt.container.writeobject(unknown source) @ sun.reflect.generatedmethodaccessor9.invoke(unknown source) @ sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source) @ java.lang.reflect.method.invoke(unknown source) @ java.io.objectstreamclass.invokewriteobject(unknown source) @ java.io.objectoutputstream.writeserialdata(unknown source) @ java.io.objectoutputstream.writeordinaryobject(unknown source) @ java.io.objectoutputstream.writeobject0(unknown source) @ java.io.objectoutputstream.writearray(unknown source) @ java.io.objectoutputstream.writeobject0(unknown source) @ java.io.objectoutputstream.access$300(unknown source) @ java.io.objectoutputstream$putfieldimpl.writefields(unknown source) @ java.io.objectoutputstream.writefields(unknown source) @ java.awt.container.writeobject(unknown source) @ sun.reflect.generatedmethodaccessor9.invoke(unknown source) @ sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source) @ java.lang.reflect.method.invoke(unknown source) @ java.io.objectstreamclass.invokewriteobject(unknown source) @ java.io.objectoutputstream.writeserialdata(unknown source) @ java.io.objectoutputstream.writeordinaryobject(unknown source) @ java.io.objectoutputstream.writeobject0(unknown source) @ java.io.objectoutputstream.writearray(unknown source) @ java.io.objectoutputstream.writeobject0(unknown source) @ java.io.objectoutputstream.access$300(unknown source) @ java.io.objectoutputstream$putfieldimpl.writefields(unknown source) @ java.io.objectoutputstream.writefields(unknown source) @ java.awt.container.writeobject(unknown source) @ sun.reflect.generatedmethodaccessor9.invoke(unknown source) @ sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source) @ java.lang.reflect.method.invoke(unknown source) @ java.io.objectstreamclass.invokewriteobject(unknown source) @ java.io.objectoutputstream.writeserialdata(unknown source) @ java.io.objectoutputstream.writeordinaryobject(unknown source) @ java.io.objectoutputstream.writeobject0(unknown source) @ java.io.objectoutputstream.writearray(unknown source) @ java.io.objectoutputstream.writeobject0(unknown source) @ java.io.objectoutputstream.access$300(unknown source) @ java.io.objectoutputstream$putfieldimpl.writefields(unknown source) @ java.io.objectoutputstream.writefields(unknown source) @ java.awt.container.writeobject(unknown source) @ sun.reflect.generatedmethodaccessor9.invoke(unknown source) @ sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source) @ java.lang.reflect.method.invoke(unknown source) @ java.io.objectstreamclass.invokewriteobject(unknown source) @ java.io.objectoutputstream.writeserialdata(unknown source) @ java.io.objectoutputstream.writeordinaryobject(unknown source) @ java.io.objectoutputstream.writeobject0(unknown source) @ java.io.objectoutputstream.writearray(unknown source) @ java.io.objectoutputstream.writeobject0(unknown source) @ java.io.objectoutputstream.access$300(unknown source) @ java.io.objectoutputstream$putfieldimpl.writefields(unknown source) @ java.io.objectoutputstream.writefields(unknown source) @ java.awt.container.writeobject(unknown source) @ sun.reflect.generatedmethodaccessor9.invoke(unknown source) @ sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source) @ java.lang.reflect.method.invoke(unknown source) @ java.io.objectstreamclass.invokewriteobject(unknown source) @ java.io.objectoutputstream.writeserialdata(unknown source) @ java.io.objectoutputstream.writeordinaryobject(unknown source) @ java.io.objectoutputstream.writeobject0(unknown source) @ java.io.objectoutputstream.writearray(unknown source) @ java.io.objectoutputstream.writeobject0(unknown source) @ java.io.objectoutputstream.access$300(unknown source) @ java.io.objectoutputstream$putfieldimpl.writefields(unknown source) @ java.io.objectoutputstream.writefields(unknown source) @ java.awt.container.writeobject(unknown source) @ sun.reflect.generatedmethodaccessor9.invoke(unknown source) @ sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source) @ java.lang.reflect.method.invoke(unknown source) @ java.io.objectstreamclass.invokewriteobject(unknown source) @ java.io.objectoutputstream.writeserialdata(unknown source) @ java.io.objectoutputstream.writeordinaryobject(unknown source) @ java.io.objectoutputstream.writeobject0(unknown source) @ java.io.objectoutputstream.defaultwritefields(unknown source) @ java.io.objectoutputstream.writeserialdata(unknown source) @ java.io.objectoutputstream.writeordinaryobject(unknown source) @ java.io.objectoutputstream.writeobject0(unknown source) @ java.io.objectoutputstream.writeobject(unknown source) @ java.awt.awteventmulticaster.save(unknown source) @ java.awt.component.writeobject(unknown source) @ sun.reflect.nativemethodaccessorimpl.invoke0(native method) @ sun.reflect.nativemethodaccessorimpl.invoke(unknown source) @ sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source) @ java.lang.reflect.method.invoke(unknown source) @ java.io.objectstreamclass.invokewriteobject(unknown source) @ java.io.objectoutputstream.writeserialdata(unknown source) @ java.io.objectoutputstream.writeordinaryobject(unknown source) @ java.io.objectoutputstream.writeobject0(unknown source) @ java.io.objectoutputstream.writeobject(unknown source) @ java.util.arraylist.writeobject(unknown source) @ sun.reflect.nativemethodaccessorimpl.invoke0(native method) @ sun.reflect.nativemethodaccessorimpl.invoke(unknown source) @ sun.reflect.delegatingmethodaccessorimpl.invoke(unknown source) @ java.lang.reflect.method.invoke(unknown source) @ java.io.objectstreamclass.invokewriteobject(unknown source) @ java.io.objectoutputstream.writeserialdata(unknown source) @ java.io.objectoutputstream.writeordinaryobject(unknown source) @ java.io.objectoutputstream.writeobject0(unknown source) @ java.io.objectoutputstream.writeobject(unknown source) @ ralaprogramme.occupancyoverview.filesave(occupancyoverview.java:542) @ ralaprogramme.occupancyoverview.action_menubar(occupancyoverview.java:298) @ ralaprogramme.occupancyoverview.actionperformed(occupancyoverview.java:260) @ javax.swing.abstractbutton.fireactionperformed(unknown source) @ javax.swing.abstractbutton$handler.actionperformed(unknown source) @ javax.swing.defaultbuttonmodel.fireactionperformed(unknown source) @ javax.swing.defaultbuttonmodel.setpressed(unknown source) @ javax.swing.abstractbutton.doclick(unknown source) @ javax.swing.plaf.basic.basicmenuitemui.doclick(unknown source) @ javax.swing.plaf.basic.basicmenuitemui$handler.mousereleased(unknown source) @ java.awt.component.processmouseevent(unknown source) @ javax.swing.jcomponent.processmouseevent(unknown source) @ java.awt.component.processevent(unknown source) @ java.awt.container.processevent(unknown source) @ java.awt.component.dispatcheventimpl(unknown source) @ java.awt.container.dispatcheventimpl(unknown source) @ java.awt.component.dispatchevent(unknown source) @ java.awt.lightweightdispatcher.retargetmouseevent(unknown source) @ java.awt.lightweightdispatcher.processmouseevent(unknown source) @ java.awt.lightweightdispatcher.dispatchevent(unknown source) @ java.awt.container.dispatcheventimpl(unknown source) @ java.awt.window.dispatcheventimpl(unknown source) @ java.awt.component.dispatchevent(unknown source) @ java.awt.eventqueue.dispatcheventimpl(unknown source) @ java.awt.eventqueue.access$200(unknown source) @ java.awt.eventqueue$3.run(unknown source) @ java.awt.eventqueue$3.run(unknown source) @ java.security.accesscontroller.doprivileged(native method) @ java.security.protectiondomain$1.dointersectionprivilege(unknown source) @ java.security.protectiondomain$1.dointersectionprivilege(unknown source) @ java.awt.eventqueue$4.run(unknown source) @ java.awt.eventqueue$4.run(unknown source) @ java.security.accesscontroller.doprivileged(native method) @ java.security.protectiondomain$1.dointersectionprivilege(unknown source) @ java.awt.eventqueue.dispatchevent(unknown source) @ java.awt.eventdispatchthread.pumponeeventforfilters(unknown source) @ java.awt.eventdispatchthread.pumpeventsforfilter(unknown source) @ java.awt.eventdispatchthread.pumpeventsforhierarchy(unknown source) @ java.awt.eventdispatchthread.pumpevents(unknown source) @ java.awt.eventdispatchthread.pumpevents(unknown source) @ java.awt.eventdispatchthread.run(unknown source)
write whole list @ once. if write each group seperately, you'll have read them in loop until exception, or you'll have send number of groups before sending groups know how many groups read. sending list easier.
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