我在反序列化xml时遇到异常“线程中的异常”main“com.thoughtworks.xstream.io.StreamException：无法创建XmlPullParser”。我添加了以下依赖
xmlpull_1_0_5.jar
xpp3_min-1.1.4.jar
xstream-1.4.8.jar
测试代码：
import java.util.AbstractMap;
import java.util.HashMap;
import java.util.Map;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
public class Test {
public static void main(String[] args) {
Map<String, String> map = new HashMap<String, String>();
map.put("name", "chris");
map.put("island", "faranga");
XStream magicApi = new XStream();
magicApi.registerConverter(new MapEntryConverter());
magicApi.alias("root", Map.class);
String xml = magicApi.toXML(map);
System.out.println("Result of tweaked XStream toXml()");
System.out.println(xml);
magicApi.fromXML(xml);
// assert extractedMap.get("name").equals("chris");
// assert extractedMap.get("island").equals("faranga");
}
public static class MapEntryConverter implements Converter {
public boolean canConvert(Class clazz) {
return AbstractMap.class.isAssignableFrom(clazz);
}
public void marshal(Object value, HierarchicalStreamWriter writer, MarshallingContext context) {
AbstractMap map = (AbstractMap) value;
for (Object obj : map.entrySet()) {
Map.Entry entry = (Map.Entry) obj;
writer.startNode(entry.getKey().toString());
Object val = entry.getValue();
if (null != val) {
writer.setValue(val.toString());
}
writer.endNode();
}
}
public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
Map<String, String> map = new HashMap<String, String>();
while (reader.hasMoreChildren()) {
reader.moveDown();
String key = reader.getNodeName(); // nodeName aka element's name
String value = reader.getValue();
map.put(key, value);
reader.moveUp();
}
return map;
}
}
}
我是否误解了一些依赖性。任何帮助对此我将不胜感激。
答案 0 :(得分：6)
我添加xpp3_min-1.1.4c.jar代替xpp3_min-1.1.4.jar。我的程序开始工作
答案 1 :(得分：1)
堆栈跟踪中未报告的基本问题是xstream 1.4.8中缺少资源
只有附加1.4.9源代码（1.4.8源代码奇怪地不可用）并进行调试时才能检测到它。
从未显示的真正错误是
caused by: org.xmlpull.v1.XmlPullParserException: resource not found: /META-INF/services/org.xmlpull.v1.XmlPullParserFactory make sure that parser implementing XmlPull API is available; nested exception is:
org.xmlpull.v1.XmlPullParserException: resource not found: /META-INF/services/org.xmlpull.v1.XmlPullParserFactory make sure that parser implementing XmlPull API is available
at org.xmlpull.v1.XmlPullParserFactory.newInstance(XmlPullParserFactory.java:278)
at org.xmlpull.v1.XmlPullParserFactory.newInstance(XmlPullParserFactory.java:259)
at com.thoughtworks.xstream.io.xml.XppDriver.createParser(XppDriver.java:57)
at com.thoughtworks.xstream.io.xml.AbstractXppDriver.createReader(AbstractXppDriver.java:54)
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1061)
at com.thoughtworks.xstream.XStream.fromXML(XStream.java:1052)
at tudelft.mmi.pn.duo.core.DUOModel.loadFromXml(DUOModel.java:289)
at tudelft.mmi.pn.duo.core.DUOModel.getNewDUOModel(DUOModel.java:182)
at domaineditor.extduomodel.ExtDuoModel.<init>(ExtDuoModel.java:56)
at domaineditor.actions.OpenFile.actionPerformed(OpenFile.java:34)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
at javax.swing.AbstractButton.doClick(AbstractButton.java:376)
at javax.swing.plaf.basic.BasicMenuItemUI.doClick(BasicMenuItemUI.java:833)
at com.apple.laf.AquaMenuItemUI.doClick(AquaMenuItemUI.java:157)
at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(BasicMenuItemUI.java:877)
at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:289)
at java.awt.Component.processMouseEvent(Component.java:6533)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3324)
at java.awt.Component.processEvent(Component.java:6298)
at java.awt.Container.processEvent(Container.java:2236)
at java.awt.Component.dispatchEventImpl(Component.java:4889)
at java.awt.Container.dispatchEventImpl(Container.java:2294)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4888)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4525)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4466)
at java.awt.Container.dispatchEventImpl(Container.java:2280)
at java.awt.Window.dispatchEventImpl(Window.java:2746)
at java.awt.Component.dispatchEvent(Component.java:4711)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:758)
at java.awt.EventQueue.access$500(EventQueue.java:97)
at java.awt.EventQueue$3.run(EventQueue.java:709)
at java.awt.EventQueue$3.run(EventQueue.java:703)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90)
at java.awt.EventQueue$4.run(EventQueue.java:731)
at java.awt.EventQueue$4.run(EventQueue.java:729)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
真正的潜在问题似乎是这个（已知）问题
答案 2 :(得分：0)
这个问题让我非常头痛。我已经解决了：
| user_id | dc_combo | dc_combo_size | dc_uid_cnt | dn_combo | dn_combo_size | dn_uid_cnt | dn_combo_cnt | sn_combo | sn_combo_size | sn_uid_cnt | sn_combo_cnt | dd_combo | dd_combo_size | dd_uid_cnt | dd_combo_cnt |
|---------|-------------|---------------|------------|----------------------|---------------|------------|--------------|---------------------------------|---------------|------------|--------------|-------------------------------------------------|---------------|------------|--------------|
| 3 | 200 | 1 | 2 | AXIOM | 1 | 4 | 3 | nsaid | 1 | 4 | 3 | nsaid10mg | 1 | 2 | 1 |
| 999 | 200 | 1 | 2 | AXIOM | 1 | 4 | 3 | nsaid | 1 | 4 | 3 | nsaid10mg | 1 | 2 | 1 |
| 175 | 300 | 1 | 1 | AXIOM | 1 | 4 | 3 | nsaid | 1 | 4 | 3 | nsaid25mg | 1 | 1 | 1 |
| 1 | 25 | 1 | 1 | AXIOM | 1 | 4 | 3 | nsaid | 1 | 4 | 3 | nsaid5mg | 1 | 1 | 1 |
| 999 | 200,350 | 2 | 1 | AXIOM,BEXERA | 2 | 3 | 5 | nsaid,potassium | 2 | 3 | 5 | nsaid10mg,potassium12mg | 2 | 1 | 1 |
| 999 | 50,200,350 | 3 | 1 | AXIOM,BEXERA | 2 | 3 | 5 | nsaid,potassium | 2 | 3 | 5 | nsaid10mg,potassium12mg,potassium20mg | 3 | 1 | 1 |
| 999 | 50,200 | 2 | 1 | AXIOM,BEXERA | 2 | 3 | 5 | nsaid,potassium | 2 | 3 | 5 | nsaid10mg,potassium20mg | 2 | 1 | 1 |
| 175 | 50,300 | 2 | 1 | AXIOM,BEXERA | 2 | 3 | 5 | nsaid,potassium | 2 | 3 | 5 | nsaid25mg,potassium20mg | 2 | 1 | 1 |
| 1 | 25,50 | 2 | 1 | AXIOM,BEXERA | 2 | 3 | 5 | nsaid,potassium | 2 | 3 | 5 | nsaid5mg,potassium20mg | 2 | 1 | 1 |
| 999 | 100,200,350 | 3 | 1 | AXIOM,BEXERA,CAZERTA | 3 | 2 | 3 | nsaid,potassium,sodium chloride | 3 | 2 | 3 | nsaid10mg,potassium12mg,sodium chloride10mg | 3 | 1 | 1 |
| 999 | 50,100,200 | 3 | 1 | AXIOM,BEXERA,CAZERTA | 3 | 2 | 3 | nsaid,potassium,sodium chloride | 3 | 2 | 3 | nsaid10mg,potassium20mg,sodium chloride10mg | 3 | 1 | 1 |
| 1 | 25,50,100 | 3 | 1 | AXIOM,BEXERA,CAZERTA | 3 | 2 | 3 | nsaid,potassium,sodium chloride | 3 | 2 | 3 | nsaid5mg,potassium20mg,sodium chloride10mg | 3 | 1 | 1 |
| 999 | 100,200 | 2 | 1 | AXIOM,CAZERTA | 2 | 2 | 2 | nsaid,sodium chloride | 2 | 2 | 2 | nsaid10mg,sodium chloride10mg | 2 | 1 | 1 |
| 1 | 25,100 | 2 | 1 | AXIOM,CAZERTA | 2 | 2 | 2 | nsaid,sodium chloride | 2 | 2 | 2 | nsaid5mg,sodium chloride10mg | 2 | 1 | 1 |
| 201 | 350 | 1 | 2 | BEXERA | 1 | 5 | 4 | potassium | 1 | 5 | 4 | potassium12mg | 1 | 2 | 1 |
| 999 | 350 | 1 | 2 | BEXERA | 1 | 5 | 4 | potassium | 1 | 5 | 4 | potassium12mg | 1 | 2 | 1 |
| 999 | 50,350 | 2 | 1 | BEXERA | 1 | 5 | 4 | potassium | 1 | 5 | 4 | potassium12mg,potassium20mg | 2 | 1 | 1 |
| 378 | 400 | 1 | 1 | BEXERA | 1 | 5 | 4 | potassium | 1 | 5 | 4 | potassium15mg | 1 | 1 | 1 |
| 1 | 50 | 1 | 3 | BEXERA | 1 | 5 | 4 | potassium | 1 | 5 | 4 | potassium20mg | 1 | 3 | 1 |
| 175 | 50 | 1 | 3 | BEXERA | 1 | 5 | 4 | potassium | 1 | 5 | 4 | potassium20mg | 1 | 3 | 1 |
| 999 | 50 | 1 | 3 | BEXERA | 1 | 5 | 4 | potassium | 1 | 5 | 4 | potassium20mg | 1 | 3 | 1 |
| 999 | 50,100,350 | 3 | 1 | BEXERA,CAZERTA | 2 | 4 | 5 | potassium,sodium chloride | 2 | 4 | 5 | potassium12mg,potassium20mg,sodium chloride10mg | 3 | 1 | 1 |
| 999 | 100,350 | 2 | 1 | BEXERA,CAZERTA | 2 | 4 | 5 | potassium,sodium chloride | 2 | 4 | 5 | potassium12mg,sodium chloride10mg | 2 | 1 | 1 |
| 201 | 350,450 | 2 | 1 | BEXERA,CAZERTA | 2 | 4 | 5 | potassium,sodium chloride | 2 | 4 | 5 | potassium12mg,sodium chloride30mg | 2 | 1 | 1 |
| 378 | 100,400 | 2 | 1 | BEXERA,CAZERTA | 2 | 4 | 5 | potassium,sodium chloride | 2 | 4 | 5 | potassium15mg,sodium chloride10mg | 2 | 1 | 1 |
| 1 | 50,100 | 2 | 2 | BEXERA,CAZERTA | 2 | 4 | 5 | potassium,sodium chloride | 2 | 4 | 5 | potassium20mg,sodium chloride10mg | 2 | 2 | 1 |
| 999 | 50,100 | 2 | 2 | BEXERA,CAZERTA | 2 | 4 | 5 | potassium,sodium chloride | 2 | 4 | 5 | potassium20mg,sodium chloride10mg | 2 | 2 | 1 |
| 1 | 100 | 1 | 3 | CAZERTA | 1 | 4 | 2 | sodium chloride | 1 | 4 | 2 | sodium chloride10mg | 1 | 3 | 1 |
| 378 | 100 | 1 | 3 | CAZERTA | 1 | 4 | 2 | sodium chloride | 1 | 4 | 2 | sodium chloride10mg | 1 | 3 | 1 |
| 999 | 100 | 1 | 3 | CAZERTA | 1 | 4 | 2 | sodium chloride | 1 | 4 | 2 | sodium chloride10mg | 1 | 3 | 1 |
| 201 | 450 | 1 | 1 | CAZERTA | 1 | 4 | 2 | sodium chloride | 1 | 4 | 2 | sodium chloride30mg | 1 | 1 | 1 |
如果仍然存在问题，请尝试导入这些
-- generalized membership
type Set a = [a]
member :: Eq a => a -> [a] -> Bool
member x [] = False
member x (y:ys) | x == y = True
| otherwise = member x ys
-- elimination of duplicates
noReps :: Set Integer -> Set Integer
noReps [] = []
noReps (x:xs) | member x xs = noReps xs
| otherwise = x : noReps xs
inclusion :: Set Integer -> Set Integer -> Bool
inclusion x y = length [i | i <- x, not (member i y)] == 0
identical :: Set Integer -> Set Integer -> Bool
identical x y = inclusion x y && inclusion y x
-- membership for sets of sets
setmember :: Set Integer -> Set (Set Integer) -> Bool
setmember [] _ = True
setmember _ [] = False
setmember x (y:ys) | identical x y = True
| otherwise = setmember x ys
addsets :: Set Integer -> Set (Set Integer) -> Set (Set Integer)
addsets x y | setmember x y = y
| otherwise = x:y
-- adding an integer to every member of a sets of sets of integers
addelem :: Integer -> Set (Set Integer) -> Set (Set Integer)
addelem x y = [noReps (x : i) | i <- y]
-- powerset of the set {1,...,n}
powerset :: Integer -> Set (Set Integer)
powerset 1 = [[], [1]]
powerset x = powerset (x-1) ++ addelem x (powerset (x-1))
参考：