Fix NullPointerException and export with character set UTF-8.

[tools400]

Bug fixes

• Fixed NullPointerException if exporting message payload from the message dialog.
  Steps to reproduce the problem:

  • Double click an existing message.
  • Click the Export button on the Payload tab.
  • Enter a file name on the Select File dialog and click the Save button.
  • Java exception:

  java.lang.NullPointerException: Cannot invoke "org.titou10.jtb.jms.model.JTBMessage.getJtbMessageType()" because 
  "jtbMessage" is null
        at org.titou10.jtb.util.Utils.exportPayloadToOS(Utils.java:315)
        at org.titou10.jtb.util.Utils.exportPayloadToOS(Utils.java:267)
        at org.titou10.jtb.dialog.MessageDialogAbstract.lambda$3(MessageDialogAbstract.java:477)
        at org.eclipse.swt.events.SelectionListener$1.widgetSelected(SelectionListener.java:84)
        at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:252)
        at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
        at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4274)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1066)
        at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4072)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3660)
        at org.eclipse.jface.window.Window.runEventLoop(Window.java:823)
        at org.eclipse.jface.window.Window.open(Window.java:799)
        at org.titou10.jtb.handler.MessageViewHandler.execute(MessageViewHandler.java:100)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:568)
        at org.eclipse.e4.core.internal.di.MethodRequestor.execute(MethodRequestor.java:58)
        at org.eclipse.e4.core.internal.di.InjectorImpl.invokeUsingClass(InjectorImpl.java:298)
        at org.eclipse.e4.core.internal.di.InjectorImpl.invoke(InjectorImpl.java:232)
        at org.eclipse.e4.core.contexts.ContextInjectionFactory.invoke(ContextInjectionFactory.java:174)
        at org.eclipse.e4.core.commands.internal.HandlerServiceHandler.execute(HandlerServiceHandler.java:165)
        at org.eclipse.core.commands.Command.executeWithChecks(Command.java:488)
        at org.eclipse.core.commands.ParameterizedCommand.executeWithChecks(ParameterizedCommand.java:485)
        at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:204)
        at org.eclipse.e4.core.commands.internal.HandlerServiceImpl.executeHandler(HandlerServiceImpl.java:186)
        at org.titou10.jtb.ui.part.content.JTBSessionContentViewPart$10.doubleClick(JTBSessionContentViewPart.java:767)
        at org.eclipse.jface.viewers.StructuredViewer$1.run(StructuredViewer.java:779)
        at org.eclipse.core.runtime.SafeRunner.run(SafeRunner.java:47)
        at org.eclipse.jface.util.SafeRunnable.run(SafeRunnable.java:174)
        at org.eclipse.jface.viewers.StructuredViewer.fireDoubleClick(StructuredViewer.java:776)
        at org.eclipse.jface.viewers.StructuredViewer.handleDoubleSelect(StructuredViewer.java:1092)
        at org.eclipse.jface.viewers.ColumnViewer.handleDoubleSelect(ColumnViewer.java:1033)
        at org.eclipse.jface.viewers.StructuredViewer$4.widgetDefaultSelected(StructuredViewer.java:1205)
        at org.eclipse.jface.util.OpenStrategy.fireDefaultSelectionEvent(OpenStrategy.java:271)
        at org.eclipse.jface.util.OpenStrategy$1.handleEvent(OpenStrategy.java:328)
        at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:89)
        at org.eclipse.swt.widgets.Display.sendEvent(Display.java:4274)
        at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1066)
        at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4072)
        at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3660)
        at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$5.run(PartRenderingEngine.java:1151)
        at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:339)
        at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:1042)
        at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:152)
        at org.eclipse.e4.ui.internal.workbench.swt.E4Application.start(E4Application.java:165)
        at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:208)
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:143)
        at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:109)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:439)
        at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:271)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:568)
        at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:651)
        at org.eclipse.equinox.launcher.Main.basicRun(Main.java:588)
        at org.eclipse.equinox.launcher.Main.run(Main.java:1459)
        at org.eclipse.equinox.launcher.Main.main(Main.java:1432)
  

• Fixed bug that payloads with Polish special characters cloud not be exported on a German Windows.
  The problem is that some characters could not be translated and stored in character set windows-1252.
  The issue was resolved by ensuring that messages are saved using the UTF-8 character set.
  Steps to reproduce the problem:

  • Double click a message of type Json or Text with special characters that cannot be displayed with character set windows-1252, e.g. Jabłonna, Zegrzyńska and Michał. The characters that cannot be displayed are; "ł", "ń" and "ł".
  • Select the Payload tab and click the Export button.
  • The message is stored like this:

{
   "Location": "Jab?onna ul. Zegrzy?ska",
   "First name": "Micha?",
   "Lastname": "Bukowski"
}

• The correct format is:

{
   "Location": "Jabłonna ul. Zegrzyńska",
   "First name": "Michał",
   "Lastname": "Bukowski"
}

• I fix the issue and refactored class org.titou10.jtb.util.Utils. Now all read/write operations of the application use the specialized readFile*/writeFile* methods of class Utils.
• It would be easy to add preferences options for selecting the required encoding like the Eclipse properties on the **General
• Workspace** tab, option Text file encoding. For now the encoding is hardcoded as StandardCharsets.UTF_8.