The difficulty to consume REST in ADF

Hey all,.

Thanks for your help!

I can't create a data control to a REST service that returns JSON.

The Rest service url is: https://btc-e.com/api/2/btc_usd/depth

Here is an example of a small subset of the data returned:

{"asks":[[552.825,0.33311602],[553.8,1],[553.887,1.92375302],[553.888,2.08576],],"bids":[[552.005,20],[552,6.13619106],[551.999,0.032],[551.8,7.94],[551.7,10.31977256],[551.502,0.2],[551.5,2.7740043],[551.118,0.0263181]]}


I used an online tool to create a XSD which is required by the wizard:

<?xml version="1.0" encoding="windows-1252" ?>
<xsd:schema xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns="http://www.example.org"
            targetNamespace="http://www.example.org" elementFormDefault="qualified">
  <xsd:element name="root">
    <xsd:complexType>
      <xsd:sequence>
        <xsd:element name="asks">
          <xsd:complexType>
            <xsd:sequence>
              <xsd:element name="ask" maxOccurs="unbounded">
                <xsd:complexType>
                  <xsd:sequence>
                    <xsd:element name="price" type="xsd:float"/>
                    <xsd:element name="size" type="xsd:float"/>
                  </xsd:sequence>
                </xsd:complexType>
              </xsd:element>
            </xsd:sequence>
          </xsd:complexType>
        </xsd:element>
        <xsd:element name="bids">
          <xsd:complexType>
            <xsd:sequence>
              <xsd:element name="bid" maxOccurs="unbounded">
                <xsd:complexType>
                  <xsd:sequence>
                    <xsd:element name="price" type="xsd:float"/>
                    <xsd:element name="size" type="xsd:float"/>
                  </xsd:sequence>
                </xsd:complexType>
              </xsd:element>
            </xsd:sequence>
          </xsd:complexType>
        </xsd:element>
      </xsd:sequence>
    </xsd:complexType>
  </xsd:element>
</xsd:schema>

Here are the steps I took in Jdeveloper 12.1.2 (Build JDEVADF_12.1.2.0.0_GENERIC_130608.2330.6668):

  1. Created a new application (Application of Fusion ADF) - taken the default config.
  2. Model right click > New > Gallery > Control(SOAP/REST) data to the Web Service
  3. Give it a name "TestDS", select REST, create a new connection (name: 'Him', endpoint: "https://btc-e.com")-connection Test passes.
  4. Next > path add a resource: (display name of method "/ api/2/btc_usd/depth": "Gdepth")
  5. Next > add the location of the XSD file above to XSD > Next - Connection Test passes
  6. Finishing

When I run the data control in the 'register of data control', I get the following error:

Unexpected exception taken: oracle.adf.model.adapter.AdapterException, msg = DCA-29000: Unexpected exception caught: oracle.xml.parser.v2.XMLParseException, msg = start of element root waited. DCA-29000: Unexpected exception caught: oracle.xml.parser.v2.XMLParseException, msg = start of element root waited. : start of element root waited.


With the trace of the following stack:


oracle.jbo.jbotester.app.ErrorHandler$ExceptionWrapper: Start of root element expected.
  at oracle.jbo.jbotester.app.ErrorHandler.displayError(ErrorHandler.java:104)
  at oracle.jbo.jbotester.app.ErrorHandler.displayError(ErrorHandler.java:90)
  at oracle.jbo.jbotester.panel.MethodPanel$6.actionPerformed(MethodPanel.java:420)
  at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
  at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
  at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
  at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
  at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
  at java.awt.Component.processMouseEvent(Component.java:6505)
  at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
  at java.awt.Component.processEvent(Component.java:6270)
  at java.awt.Container.processEvent(Container.java:2229)
  at java.awt.Component.dispatchEventImpl(Component.java:4861)
  at java.awt.Container.dispatchEventImpl(Container.java:2287)
  at java.awt.Component.dispatchEvent(Component.java:4687)
  at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
  at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
  at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
  at java.awt.Container.dispatchEventImpl(Container.java:2273)
  at java.awt.Window.dispatchEventImpl(Window.java:2719)
  at java.awt.Component.dispatchEvent(Component.java:4687)
  at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:729)
  at java.awt.EventQueue.access$200(EventQueue.java:103)
  at java.awt.EventQueue$3.run(EventQueue.java:688)
  at java.awt.EventQueue$3.run(EventQueue.java:686)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
  at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
  at java.awt.EventQueue$4.run(EventQueue.java:702)
  at java.awt.EventQueue$4.run(EventQueue.java:700)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
  at java.awt.EventQueue.dispatchEvent(EventQueue.java:699)
  at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
  at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
  at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
  at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
  at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
  at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
Caused by: oracle.adf.model.adapter.AdapterException: DCA-29000: Unexpected exception caught: oracle.adf.model.adapter.AdapterException, msg=DCA-29000: Unexpected exception caught: oracle.xml.parser.v2.XMLParseException, msg=Start of root element expected.
  at oracle.adf.model.adapter.dataformat.XMLHandler.<init>(XMLHandler.java:229)
  at oracle.adf.model.adapter.dataformat.XMLHandler.<init>(XMLHandler.java:246)
  at oracle.adfinternal.model.adapter.XMLChildOperation.invokeOperationInternal(ChildOperation.java:960)
  at oracle.adfinternal.model.adapter.ChildOperation.invokeOperation(ChildOperation.java:529)
  at oracle.adf.model.adapter.rest.RestURLDataControl.invokeOperation(RestURLDataControl.java:119)
  at oracle.jbo.jbotester.panel.MethodPanel$6.actionPerformed(MethodPanel.java:408)
  ... 36 more
Caused by: oracle.adf.model.adapter.AdapterException: DCA-29000: Unexpected exception caught: oracle.xml.parser.v2.XMLParseException, msg=Start of root element expected.
  at oracle.adf.model.adapter.dataformat.XMLHandler.parseDataStream(XMLHandler.java:699)
  at oracle.adf.model.adapter.dataformat.XMLHandler.<init>(XMLHandler.java:224)
  ... 41 more
Caused by: oracle.xml.parser.v2.XMLParseException; lineNumber: 1; columnNumber: 1; Start of root element expected.
  at oracle.xml.parser.v2.XMLError.flushErrors1(XMLError.java:326)
  at oracle.xml.parser.v2.NonValidatingParser.parseRootElement(NonValidatingParser.java:453)
  at oracle.xml.parser.v2.NonValidatingParser.parseDocument(NonValidatingParser.java:394)
  at oracle.xml.parser.v2.XMLParser.parse(XMLParser.java:335)
  at oracle.adf.model.adapter.dataformat.XMLHandler.parseDataStream(XMLHandler.java:691)
  ... 42 more
## Detail 0 ##
oracle.adf.model.adapter.AdapterException: DCA-29000: Unexpected exception caught: oracle.adf.model.adapter.AdapterException, msg=DCA-29000: Unexpected exception caught: oracle.xml.parser.v2.XMLParseException, msg=Start of root element expected.
  at oracle.adf.model.adapter.dataformat.XMLHandler.<init>(XMLHandler.java:229)
  at oracle.adf.model.adapter.dataformat.XMLHandler.<init>(XMLHandler.java:246)
  at oracle.adfinternal.model.adapter.XMLChildOperation.invokeOperationInternal(ChildOperation.java:960)
  at oracle.adfinternal.model.adapter.ChildOperation.invokeOperation(ChildOperation.java:529)
  at oracle.adf.model.adapter.rest.RestURLDataControl.invokeOperation(RestURLDataControl.java:119)
  at oracle.jbo.jbotester.panel.MethodPanel$6.actionPerformed(MethodPanel.java:408)
  at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
  at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
  at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
  at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
  at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
  at java.awt.Component.processMouseEvent(Component.java:6505)
  at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
  at java.awt.Component.processEvent(Component.java:6270)
  at java.awt.Container.processEvent(Container.java:2229)
  at java.awt.Component.dispatchEventImpl(Component.java:4861)
  at java.awt.Container.dispatchEventImpl(Container.java:2287)
  at java.awt.Component.dispatchEvent(Component.java:4687)
  at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
  at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
  at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
  at java.awt.Container.dispatchEventImpl(Container.java:2273)
  at java.awt.Window.dispatchEventImpl(Window.java:2719)
  at java.awt.Component.dispatchEvent(Component.java:4687)
  at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:729)
  at java.awt.EventQueue.access$200(EventQueue.java:103)
  at java.awt.EventQueue$3.run(EventQueue.java:688)
  at java.awt.EventQueue$3.run(EventQueue.java:686)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
  at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
  at java.awt.EventQueue$4.run(EventQueue.java:702)
  at java.awt.EventQueue$4.run(EventQueue.java:700)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
  at java.awt.EventQueue.dispatchEvent(EventQueue.java:699)
  at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
  at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
  at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
  at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
  at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
  at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
Caused by: oracle.adf.model.adapter.AdapterException: DCA-29000: Unexpected exception caught: oracle.xml.parser.v2.XMLParseException, msg=Start of root element expected.
  at oracle.adf.model.adapter.dataformat.XMLHandler.parseDataStream(XMLHandler.java:699)
  at oracle.adf.model.adapter.dataformat.XMLHandler.<init>(XMLHandler.java:224)
  ... 41 more
Caused by: oracle.xml.parser.v2.XMLParseException; lineNumber: 1; columnNumber: 1; Start of root element expected.
  at oracle.xml.parser.v2.XMLError.flushErrors1(XMLError.java:326)
  at oracle.xml.parser.v2.NonValidatingParser.parseRootElement(NonValidatingParser.java:453)
  at oracle.xml.parser.v2.NonValidatingParser.parseDocument(NonValidatingParser.java:394)
  at oracle.xml.parser.v2.XMLParser.parse(XMLParser.java:335)
  at oracle.adf.model.adapter.dataformat.XMLHandler.parseDataStream(XMLHandler.java:691)
  ... 42 more
## Detail 0 ##
oracle.adf.model.adapter.AdapterException: DCA-29000: Unexpected exception caught: oracle.xml.parser.v2.XMLParseException, msg=Start of root element expected.
  at oracle.adf.model.adapter.dataformat.XMLHandler.parseDataStream(XMLHandler.java:699)
  at oracle.adf.model.adapter.dataformat.XMLHandler.<init>(XMLHandler.java:224)
  at oracle.adf.model.adapter.dataformat.XMLHandler.<init>(XMLHandler.java:246)
  at oracle.adfinternal.model.adapter.XMLChildOperation.invokeOperationInternal(ChildOperation.java:960)
  at oracle.adfinternal.model.adapter.ChildOperation.invokeOperation(ChildOperation.java:529)
  at oracle.adf.model.adapter.rest.RestURLDataControl.invokeOperation(RestURLDataControl.java:119)
  at oracle.jbo.jbotester.panel.MethodPanel$6.actionPerformed(MethodPanel.java:408)
  at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
  at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
  at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
  at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
  at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
  at java.awt.Component.processMouseEvent(Component.java:6505)
  at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
  at java.awt.Component.processEvent(Component.java:6270)
  at java.awt.Container.processEvent(Container.java:2229)
  at java.awt.Component.dispatchEventImpl(Component.java:4861)
  at java.awt.Container.dispatchEventImpl(Container.java:2287)
  at java.awt.Component.dispatchEvent(Component.java:4687)
  at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
  at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
  at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
  at java.awt.Container.dispatchEventImpl(Container.java:2273)
  at java.awt.Window.dispatchEventImpl(Window.java:2719)
  at java.awt.Component.dispatchEvent(Component.java:4687)
  at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:729)
  at java.awt.EventQueue.access$200(EventQueue.java:103)
  at java.awt.EventQueue$3.run(EventQueue.java:688)
  at java.awt.EventQueue$3.run(EventQueue.java:686)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
  at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
  at java.awt.EventQueue$4.run(EventQueue.java:702)
  at java.awt.EventQueue$4.run(EventQueue.java:700)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
  at java.awt.EventQueue.dispatchEvent(EventQueue.java:699)
  at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
  at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
  at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
  at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
  at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
  at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)
Caused by: oracle.xml.parser.v2.XMLParseException; lineNumber: 1; columnNumber: 1; Start of root element expected.
  at oracle.xml.parser.v2.XMLError.flushErrors1(XMLError.java:326)
  at oracle.xml.parser.v2.NonValidatingParser.parseRootElement(NonValidatingParser.java:453)
  at oracle.xml.parser.v2.NonValidatingParser.parseDocument(NonValidatingParser.java:394)
  at oracle.xml.parser.v2.XMLParser.parse(XMLParser.java:335)
  at oracle.adf.model.adapter.dataformat.XMLHandler.parseDataStream(XMLHandler.java:691)
  ... 42 more
## Detail 0 ##
oracle.xml.parser.v2.XMLParseException; lineNumber: 1; columnNumber: 1; Start of root element expected.
  at oracle.xml.parser.v2.XMLError.flushErrors1(XMLError.java:326)
  at oracle.xml.parser.v2.NonValidatingParser.parseRootElement(NonValidatingParser.java:453)
  at oracle.xml.parser.v2.NonValidatingParser.parseDocument(NonValidatingParser.java:394)
  at oracle.xml.parser.v2.XMLParser.parse(XMLParser.java:335)
  at oracle.adf.model.adapter.dataformat.XMLHandler.parseDataStream(XMLHandler.java:691)
  at oracle.adf.model.adapter.dataformat.XMLHandler.<init>(XMLHandler.java:224)
  at oracle.adf.model.adapter.dataformat.XMLHandler.<init>(XMLHandler.java:246)
  at oracle.adfinternal.model.adapter.XMLChildOperation.invokeOperationInternal(ChildOperation.java:960)
  at oracle.adfinternal.model.adapter.ChildOperation.invokeOperation(ChildOperation.java:529)
  at oracle.adf.model.adapter.rest.RestURLDataControl.invokeOperation(RestURLDataControl.java:119)
  at oracle.jbo.jbotester.panel.MethodPanel$6.actionPerformed(MethodPanel.java:408)
  at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2018)
  at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2341)
  at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)
  at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:259)
  at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:252)
  at java.awt.Component.processMouseEvent(Component.java:6505)
  at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
  at java.awt.Component.processEvent(Component.java:6270)
  at java.awt.Container.processEvent(Container.java:2229)
  at java.awt.Component.dispatchEventImpl(Component.java:4861)
  at java.awt.Container.dispatchEventImpl(Container.java:2287)
  at java.awt.Component.dispatchEvent(Component.java:4687)
  at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
  at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4492)
  at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
  at java.awt.Container.dispatchEventImpl(Container.java:2273)
  at java.awt.Window.dispatchEventImpl(Window.java:2719)
  at java.awt.Component.dispatchEvent(Component.java:4687)
  at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:729)
  at java.awt.EventQueue.access$200(EventQueue.java:103)
  at java.awt.EventQueue$3.run(EventQueue.java:688)
  at java.awt.EventQueue$3.run(EventQueue.java:686)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
  at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
  at java.awt.EventQueue$4.run(EventQueue.java:702)
  at java.awt.EventQueue$4.run(EventQueue.java:700)
  at java.security.AccessController.doPrivileged(Native Method)
  at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
  at java.awt.EventQueue.dispatchEvent(EventQueue.java:699)
  at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)
  at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)
  at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)
  at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)
  at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
  at java.awt.EventDispatchThread.run(EventDispatchThread.java:91)

Thanks for your help,

NRage

currently the data service REST command is for REST services that return XML.

For Json results, you should write a Java class that calls the service, analyze the values returned and then expose this class Java as a control data to use in your applications to the ADF.

Tags: Java

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