java - JTree DataFlavor issue -
i'm implementing d&d jtree. have written custom transferhandler , created new transferable class. class if easy:
public class treepathtransferable implements transferable{ private static final dataflavor[] flavors = new dataflavor[] { new dataflavor(treepath[].class,"treepaths")}; private treepath[] data; public treepathtransferable(treepath[] data) { super(); this.data = data; } public dataflavor[] gettransferdataflavors() { return flavors; } public boolean isdataflavorsupported(dataflavor flavor) { return flavors[0].equals(flavor); } public treepath[] gettransferdata(dataflavor flavor) throws unsupportedflavorexception, ioexception{ return data; } } if "on drop" call
dtde.gettransferable().gettransferdata(dtde.gettransferable().gettransferdataflavors()[0]) i java.io.notserializableexception. if change data-object in treepathtransferable object in following way:
public class treepathtransferable implements transferable{ private static final dataflavor[] flavors = new dataflavor[] { new dataflavor(object.class,"object")}; private object data; public treepathtransferable(object data) { super(); this.data = data; } public dataflavor[] gettransferdataflavors() { return flavors; } public boolean isdataflavorsupported(dataflavor flavor) { return flavors[0].equals(flavor); } public object gettransferdata(dataflavor flavor) throws unsupportedflavorexception, ioexception{ return data; } } everything works fine. makes no sense me. why difference?
stack trace
note: have replaced non-serializable class xxx. property of subclass of defaultmutabletreenode. subclass not serializable, exception meaningful, why doesn't appear in second case?
java.io.notserializableexception: xxx @ java.io.objectoutputstream.writeobject0(objectoutputstream.java:1184) @ java.io.objectoutputstream.defaultwritefields(objectoutputstream.java:1548) @ java.io.objectoutputstream.writeserialdata(objectoutputstream.java:1509) @ java.io.objectoutputstream.writeordinaryobject(objectoutputstream.java:1432) @ java.io.objectoutputstream.writeobject0(objectoutputstream.java:1178) @ java.io.objectoutputstream.writeobject(objectoutputstream.java:348) @ java.util.hashmap.internalwriteentries(hashmap.java:1777) @ java.util.hashmap.writeobject(hashmap.java:1354) @ sun.reflect.nativemethodaccessorimpl.invoke0(native method) @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:62) @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43) @ java.lang.reflect.method.invoke(method.java:497) @ java.io.objectstreamclass.invokewriteobject(objectstreamclass.java:988) @ java.io.objectoutputstream.writeserialdata(objectoutputstream.java:1496) @ java.io.objectoutputstream.writeordinaryobject(objectoutputstream.java:1432) @ java.io.objectoutputstream.writeobject0(objectoutputstream.java:1178) @ java.io.objectoutputstream.defaultwritefields(objectoutputstream.java:1548) @ java.io.objectoutputstream.writeserialdata(objectoutputstream.java:1509) @ java.io.objectoutputstream.writeordinaryobject(objectoutputstream.java:1432) @ java.io.objectoutputstream.writeobject0(objectoutputstream.java:1178) @ java.io.objectoutputstream.writearray(objectoutputstream.java:1378) @ java.io.objectoutputstream.writeobject0(objectoutputstream.java:1174) @ java.io.objectoutputstream.writeobject(objectoutputstream.java:348) @ javax.swing.tree.defaultmutabletreenode.writeobject(defaultmutabletreenode.java:1287) @ sun.reflect.nativemethodaccessorimpl.invoke0(native method) @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:62) @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43) @ java.lang.reflect.method.invoke(method.java:497) @ java.io.objectstreamclass.invokewriteobject(objectstreamclass.java:988) @ java.io.objectoutputstream.writeserialdata(objectoutputstream.java:1496) @ java.io.objectoutputstream.writeordinaryobject(objectoutputstream.java:1432) @ java.io.objectoutputstream.writeobject0(objectoutputstream.java:1178) @ java.io.objectoutputstream.writearray(objectoutputstream.java:1378) @ java.io.objectoutputstream.writeobject0(objectoutputstream.java:1174) @ java.io.objectoutputstream.access$300(objectoutputstream.java:162) @ java.io.objectoutputstream$putfieldimpl.writefields(objectoutputstream.java:1707) @ java.io.objectoutputstream.writefields(objectoutputstream.java:482) @ java.util.vector.writeobject(vector.java:1077) @ sun.reflect.nativemethodaccessorimpl.invoke0(native method) @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:62) @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43) @ java.lang.reflect.method.invoke(method.java:497) @ java.io.objectstreamclass.invokewriteobject(objectstreamclass.java:988) @ java.io.objectoutputstream.writeserialdata(objectoutputstream.java:1496) @ java.io.objectoutputstream.writeordinaryobject(objectoutputstream.java:1432) @ java.io.objectoutputstream.writeobject0(objectoutputstream.java:1178) @ java.io.objectoutputstream.defaultwritefields(objectoutputstream.java:1548) @ java.io.objectoutputstream.defaultwriteobject(objectoutputstream.java:441) @ javax.swing.tree.defaultmutabletreenode.writeobject(defaultmutabletreenode.java:1278) @ sun.reflect.nativemethodaccessorimpl.invoke0(native method) @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:62) @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43) @ java.lang.reflect.method.invoke(method.java:497) @ java.io.objectstreamclass.invokewriteobject(objectstreamclass.java:988) @ java.io.objectoutputstream.writeserialdata(objectoutputstream.java:1496) @ java.io.objectoutputstream.writeordinaryobject(objectoutputstream.java:1432) @ java.io.objectoutputstream.writeobject0(objectoutputstream.java:1178) @ java.io.objectoutputstream.defaultwritefields(objectoutputstream.java:1548) @ java.io.objectoutputstream.defaultwriteobject(objectoutputstream.java:441) @ javax.swing.tree.defaultmutabletreenode.writeobject(defaultmutabletreenode.java:1278) @ sun.reflect.nativemethodaccessorimpl.invoke0(native method) @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:62) @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43) @ java.lang.reflect.method.invoke(method.java:497) @ java.io.objectstreamclass.invokewriteobject(objectstreamclass.java:988) @ java.io.objectoutputstream.writeserialdata(objectoutputstream.java:1496) @ java.io.objectoutputstream.writeordinaryobject(objectoutputstream.java:1432) @ java.io.objectoutputstream.writeobject0(objectoutputstream.java:1178) @ java.io.objectoutputstream.defaultwritefields(objectoutputstream.java:1548) @ java.io.objectoutputstream.defaultwriteobject(objectoutputstream.java:441) @ javax.swing.tree.defaultmutabletreenode.writeobject(defaultmutabletreenode.java:1278) @ sun.reflect.nativemethodaccessorimpl.invoke0(native method) @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:62) @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43) @ java.lang.reflect.method.invoke(method.java:497) @ java.io.objectstreamclass.invokewriteobject(objectstreamclass.java:988) @ java.io.objectoutputstream.writeserialdata(objectoutputstream.java:1496) @ java.io.objectoutputstream.writeordinaryobject(objectoutputstream.java:1432) @ java.io.objectoutputstream.writeobject0(objectoutputstream.java:1178) @ java.io.objectoutputstream.defaultwritefields(objectoutputstream.java:1548) @ java.io.objectoutputstream.defaultwriteobject(objectoutputstream.java:441) @ javax.swing.tree.defaultmutabletreenode.writeobject(defaultmutabletreenode.java:1278) @ sun.reflect.nativemethodaccessorimpl.invoke0(native method) @ sun.reflect.nativemethodaccessorimpl.invoke(nativemethodaccessorimpl.java:62) @ sun.reflect.delegatingmethodaccessorimpl.invoke(delegatingmethodaccessorimpl.java:43) @ java.lang.reflect.method.invoke(method.java:497) @ java.io.objectstreamclass.invokewriteobject(objectstreamclass.java:988) @ java.io.objectoutputstream.writeserialdata(objectoutputstream.java:1496) @ java.io.objectoutputstream.writeordinaryobject(objectoutputstream.java:1432) @ java.io.objectoutputstream.writeobject0(objectoutputstream.java:1178) @ java.io.objectoutputstream.defaultwritefields(objectoutputstream.java:1548) @ java.io.objectoutputstream.writeserialdata(objectoutputstream.java:1509) @ java.io.objectoutputstream.writeordinaryobject(objectoutputstream.java:1432) @ java.io.objectoutputstream.writeobject0(objectoutputstream.java:1178) @ java.io.objectoutputstream.writearray(objectoutputstream.java:1378) @ java.io.objectoutputstream.writeobject0(objectoutputstream.java:1174) @ java.io.objectoutputstream.writeobject(objectoutputstream.java:348) @ sun.awt.datatransfer.transferableproxy.gettransferdata(transferableproxy.java:83) @ java.awt.dnd.droptargetcontext$transferableproxy.gettransferdata(droptargetcontext.java:376) transferhandler
public class mytreetransferhandler extends transferhandler { public mytreetransferhandler() { super(); } protected transferable createtransferable(jcomponent c) { transferable t = null; if(c instanceof jtree) { jtree tree = (jtree) c; t = new treepathtransferable(tree.getselectionpaths()); return t; } return t; } public int getsourceactions(jcomponent c) { return transferhandler.move; } public boolean canimport(jcomponent c, dataflavor[] flavors){ return true; } }
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