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How to unmount a card using XStream

It seems I can not properly classify the map using XStream.

I have the following code:

Storage class

public class Storage { @XStreamAsAttribute private String basedir; @XStreamAsAttribute private Map<String, Repository> repositories = new LinkedHashMap<String, Repository>(); ... }

Repository class

 public class Repository { @XStreamAsAttribute private String name; @XStreamAsAttribute private String basedir; @XStreamAsAttribute private int policy; @XStreamAsAttribute private int layout; @XStreamAsAttribute private int type; ... }

Class ConfigurationParser

 public class ConfigurationParser { public Storage parseConfiguration(String xmlFile) throws FileNotFoundException { FileInputStream fis = new FileInputStream(xmlFile); XStream xstream = new XStream(); xstream.autodetectAnnotations(true); xstream.alias("storage", Storage.class); xstream.alias("repositories", Map.class); xstream.alias("repository", Repository.class); return (Storage) xstream.fromXML(fis); } }

configuration.xml

 <storage> <basedir>storages/storage0</basedir> <repositories> <repository> <name>repository0</name> <policy>snapshots</policy> <layout>maven2</layout> <type>hosted</type> </repository> </repositories> </storage>

Can someone please give me some tips on what is wrong. This error message is:

 com.thoughtworks.xstream.converters.ConversionException: name : name ---- Debugging information ---- message : name cause-exception : com.thoughtworks.xstream.mapper.CannotResolveClassException cause-message : name class : java.util.HashMap required-type : java.util.HashMap converter-type : com.thoughtworks.xstream.converters.collections.MapConverter path : /storage/repositories/repository/name line number : 5 class[1] : org.foo.storage.Storage converter-type[1] : com.thoughtworks.xstream.converters.reflection.ReflectionConverter version : null ------------------------------- at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:79) at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshallField(AbstractReflectionConverter.java:355) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:306) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:234) at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50) at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134) at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32) at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1058) at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1042) at com.thoughtworks.xstream.XStream.fromXML(XStream.java:922) at org.foo.configuration.ConfigurationParser.parseConfiguration(ConfigurationParser.java:36) at org.foo.configuration.ConfigurationParserTest.testParseConfiguration(ConfigurationParserTest.java:26) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42) at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222) at org.junit.runners.ParentRunner.run(ParentRunner.java:300) at org.junit.runner.JUnitCore.run(JUnitCore.java:157) at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(JUnit4IdeaTestRunner.java:74) at com.intellij.rt.execution.junit.JUnitStarter.prepareStreamsAndStart(JUnitStarter.java:196) at com.intellij.rt.execution.junit.JUnitStarter.main(JUnitStarter.java:64) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120) Caused by: com.thoughtworks.xstream.mapper.CannotResolveClassException: name at com.thoughtworks.xstream.mapper.DefaultMapper.realClass(DefaultMapper.java:56) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.DynamicProxyMapper.realClass(DynamicProxyMapper.java:55) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.PackageAliasingMapper.realClass(PackageAliasingMapper.java:88) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.ClassAliasingMapper.realClass(ClassAliasingMapper.java:79) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.ArrayMapper.realClass(ArrayMapper.java:74) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.CachingMapper.realClass(CachingMapper.java:45) at com.thoughtworks.xstream.core.util.HierarchicalStreams.readClassType(HierarchicalStreams.java:29) at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.readItem(AbstractCollectionConverter.java:70) at com.thoughtworks.xstream.converters.collections.MapConverter.putCurrentEntryIntoMap(MapConverter.java:86) at com.thoughtworks.xstream.converters.collections.MapConverter.populateMap(MapConverter.java:78) at com.thoughtworks.xstream.converters.collections.MapConverter.populateMap(MapConverter.java:72) at com.thoughtworks.xstream.converters.collections.MapConverter.unmarshal(MapConverter.java:67) at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) ... 42 more

Update 1:

That's right, therefore ... if I have:

Class ConfigurationParser

 public Storage parseConfiguration(String xmlFile) throws FileNotFoundException { FileInputStream fis = new FileInputStream(xmlFile); XStream xstream = new XStream(); xstream.autodetectAnnotations(true); xstream.alias("storage", Storage.class); return (Storage) xstream.fromXML(fis); }

Repository class

 public class Repository { @XStreamAlias(value = "name") private String name; @XStreamAlias (value = "basedir") private String basedir; @XStreamAlias (value = "policy") private String policy = RepositoryPolicyEnum.MIXED.getPolicy(); @XStreamAlias (value = "layout") private String layout = RepositoryLayoutEnum.MAVEN_2.getLayout(); @XStreamAlias (value = "type") private String type = RepositoryTypeEnum.HOSTED.getType(); ... }

and

configuration.xml

 <storage> <basedir>storages/storage0</basedir> <repository> <basedir>/here</basedir> <name>repository0</name> <policy>snapshots</policy> <layout>maven2</layout> <type>hosted</type> </repository> <repository> <basedir>/here2</basedir> <name>repository2</name> <policy>snapshots</policy> <layout>maven2</layout> <type>hosted</type> </repository> </storage>

It works. However, I would like configure.xml look like this:

 <storage> <basedir>storages/storage0</basedir> <repositories> <repository> <name>repository0</name> <policy>snapshots</policy> <layout>maven2</layout> <type>hosted</type> </repository> </repositories> </storage>

Any suggestions...?

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1 answer

Try this one

 XStream xstream = new XStream(); xstream.alias("storage", Storage.class); xstream.alias("repository", Map.class); xstream.registerConverter(new MapEntryConverter()); Storage storage = (Storage) xstream.fromXML(fis); System.out.println(storage);

and your converter

 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()) { Entry entry = (Entry) obj; writer.startNode(entry.getKey().toString()); writer.setValue(entry.getValue().toString()); writer.endNode(); } } public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) { Repository repo = new Repository(); while (reader.hasMoreChildren()) { reader.moveDown(); String nodeName = reader.getNodeName(); if ("name".equalsIgnoreCase(nodeName)) { repo.setName(reader.getValue()); } else if ("policy".equalsIgnoreCase(nodeName)) { repo.setPolicy(reader.getValue()); } else if ("layout".equalsIgnoreCase(nodeName)) { repo.setLayout(reader.getValue()); } else if ("type".equalsIgnoreCase(nodeName)) { repo.setType(reader.getValue()); } reader.moveUp(); } return repo; } }

And my classes are simple pojos

 public class Storage { private String basedir; private List<Repository> repositories = new ArrayList<Repository>(); ... } public class Repository { private String name; private String policy; private String layout; private String type; ... }
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Source: https://habr.com/ru/post/1235131/

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