title: Jackson: deserialization of Map
body: <p>I'm using Jackson to deserialize a json file (that I serialized with jackson).   The json is a simple HashMap, but the mapper is complaining when I try and deserialize.</p>
  
  <pre><code>org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of java.util.HashMap out of START_ARRAY token
  </code></pre>
  
  <p>My serialized HashMap string.....</p>
  
  <pre><code>{
  "0f861a9a-0a3e-40a7-8ff3-0b83d8070876" : {
  "name" : "BAR.xml",
  "filePath" : "/FOO/repo/BAR.xml"
  },
  "f3cbb32e-b7b8-4af1-b48b-7ea393de7971" : {
  "name" : "BLAH.xml",
  "filePath" : "/FOO/repo/BLAH.xml"
  },
  "012009b6-26e9-4bc1-9050-2a4ac9546c7e" : {
  "name" : "Check System.xml",
  "filePath" : "/FOO/repo/Check System.xml"
  }
  }
  </code></pre>
  
  <p>I've tried 2 different ways to make this work, and both fail...</p>
  
  <pre><code>//doesn't work    
  cache = (Map&lt;String,UUIDInfo&gt;) mapper.readValue(bytes.toString(), new TypeReference&lt;HashMap&lt;String,UUIDInfo&gt;&gt;(){});
  
  //doesn't work.
  cache = (Map&lt;String,UUIDInfo&gt;) mapper.readValue(bytes.toString(), TypeFactory.mapType(HashMap.class, String.class, UUIDInfo.class));
  </code></pre>
  
  <p>The full stacktrace</p>
  
  <pre><code>org.codehaus.jackson.map.JsonMappingException: Can not deserialize instance of java.util.LinkedHashMap out of START_ARRAY token
   at [Source: java.io.StringReader@32b9bd47; line: 1, column: 1]
      at org.codehaus.jackson.map.JsonMappingException.from(JsonMappingException.java:163)
      at org.codehaus.jackson.map.deser.StdDeserializationContext.mappingException(StdDeserializationContext.java:198)
      at org.codehaus.jackson.map.deser.MapDeserializer.deserialize(MapDeserializer.java:151)
      at org.codehaus.jackson.map.deser.MapDeserializer.deserialize(MapDeserializer.java:25)
      at org.codehaus.jackson.map.ObjectMapper._readMapAndClose(ObjectMapper.java:2395)
      at org.codehaus.jackson.map.ObjectMapper.readValue(ObjectMapper.java:1602)
      at com.hp.oo.studio.shared.UUIDRegistry.UUIDRegistry.&lt;init&gt;(UUIDRegistry.java:63)
      at com.hp.oo.studio.shared.UUIDRegistry.UUIDRegistry.&lt;clinit&gt;(UUIDRegistry.java:37)
      at com.hp.oo.studio.shared.StudioShared.loadUUIDRegistry(StudioShared.java:93)
      at com.hp.oo.studio.shared.StudioShared.start(StudioShared.java:42)
      at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:711)
      at java.security.AccessController.doPrivileged(Native Method)
      at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:702)
      at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:683)
      at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:381)
      at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:299)
      at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:440)
      at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:268)
      at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:107)
      at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:462)
      at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)
      at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:400)
      at org.eclipse.osgi.internal.loader.SingleSourcePackage.loadClass(SingleSourcePackage.java:35)
      at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:473)
      at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:429)
      at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:417)
      at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
      at com.hp.oo.studio.StudioUI.registerFile(StudioUI.java:133)
      at com.hp.oo.studio.StudioUI.findFilesInDirectory(StudioUI.java:125)
      at com.hp.oo.studio.StudioUI.findFilesInDirectory(StudioUI.java:120)
      at com.hp.oo.studio.StudioUI.start(StudioUI.java:75)
      at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:711)
      at java.security.AccessController.doPrivileged(Native Method)
      at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:702)
      at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:683)
      at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:381)
      at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:299)
      at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:440)
      at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:268)
      at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:107)
      at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:462)
      at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)
      at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:400)
      at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:476)
      at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:429)
      at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:417)
      at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
      at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
      at org.eclipse.osgi.internal.loader.BundleLoader.loadClass(BundleLoader.java:345)
      at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:229)
      at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1207)
      at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:174)
      at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:905)
      at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)
      at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:55)
      at org.eclipse.ui.internal.WorkbenchPlugin$1.run(WorkbenchPlugin.java:268)
      at org.eclipse.swt.custom.BusyIndicator.showWhile(BusyIndicator.java:70)
      at org.eclipse.ui.internal.WorkbenchPlugin.createExtension(WorkbenchPlugin.java:264)
      at org.eclipse.ui.internal.registry.EditorDescriptor.createEditor(EditorDescriptor.java:235)
      at org.eclipse.ui.internal.EditorManager.createPart(EditorManager.java:875)
      at org.eclipse.ui.internal.EditorReference.createPartHelper(EditorReference.java:609)
      at org.eclipse.ui.internal.EditorReference.createPart(EditorReference.java:465)
      at org.eclipse.ui.internal.WorkbenchPartReference.getPart(WorkbenchPartReference.java:595)
      at org.eclipse.ui.internal.EditorAreaHelper.setVisibleEditor(EditorAreaHelper.java:271)
      at org.eclipse.ui.internal.EditorManager.setVisibleEditor(EditorManager.java:1459)
      at org.eclipse.ui.internal.EditorManager$5.runWithException(EditorManager.java:972)
      at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
      at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
      at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)
      at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3563)
      at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3212)
      at org.eclipse.ui.application.WorkbenchAdvisor.openWindows(WorkbenchAdvisor.java:803)
      at org.eclipse.ui.internal.Workbench$33.runWithException(Workbench.java:1595)
      at org.eclipse.ui.internal.StartupThreading$StartupRunnable.run(StartupThreading.java:31)
      at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35)
      at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:135)
          at org.eclipse.swt.widgets.Display.runAsyncMessages(Display.java:3563)
      at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3212)
      at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2604)
      at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494)
      at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674)
      at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
      at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667)
      at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
      at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123)
      at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)
      at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
      at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
      at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344)
      at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
      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 org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622)
      at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577)
      at org.eclipse.equinox.launcher.Main.run(Main.java:1410)
      at org.eclipse.equinox.launcher.Main.main(Main.java:1386)
  </code></pre>