[x3d-public] X3DJSAIL, X3dToJava.xslt and DOM X3DLoaderObjecttesting:anotherClassCastException
John Carlson
yottzumm at gmail.com
Thu Jun 7 01:30:20 PDT 2018
Solution is in green below. I don’t think it’s my version, as I print out the DOM, and get:
<ViewpointGroup description="Available viewpoints">
<Viewpoint DEF="DefaultView" description="Hello X3DJSAIL"/>
<Viewpoint DEF="TopDownView"
description="top-down view from above"
orientation="1 0 0 -1.570796" position="0 100 0"/>
</ViewpointGroup>
Here’s what I do from when I print the DOM to the end of the program…all pretty much X3DJSAIL:
print(loader.serializeDOM(loader.getX3DVersion(jsobj), document));
var X3DLoaderObject = Java.type("org.web3d.x3d.jsail.X3DLoaderObject")
var xmlLoader = new X3DLoaderObject();
var X3D0 = xmlLoader.toX3dObjectTree(document);
X3D0.toFileX3D("./nashorn/examples/Json.x3d");
X3D0.toFileJSON("./nashorn/examples/Json.json");
I can try converting it to a Java program if you like, or I can try running your code to see if I can generate the error with your code. Thus, I ran:
$ java -cp ../jars/X3DJSAIL.3.3.full.jar org.web3d.x3d.jsail.CommandLine ../examples/HelloWorldProgramOutput.x3d -tofile foo.xml -toXML
foo.xml contains the Viewpoints
Here is my program that has the Viewpoints when the DOM is printed, but is missing it when toFileX3D is called (nashorn/examples/Java.java)
import net.coderextreme.X3DJSONLD;
import org.w3c.dom.Document;
import javax.json.JsonObject;
import java.io.File;
import org.web3d.x3d.jsail.X3DLoaderObject;
import org.web3d.x3d.jsail.Core.X3DObject;
class Java {
public static void main(String [] args) throws Exception {
X3DJSONLD loader = new X3DJSONLD();
JsonObject jsobj = loader.readJsonFile(new File("./nashorn/examples/HelloWorldProgramOutput.json"));
Document document = loader.loadJsonIntoDocument(jsobj);
System.out.print(loader.serializeDOM(loader.getX3DVersion(jsobj), document));
X3DLoaderObject xmlLoader = new X3DLoaderObject();
X3DObject X3D0 = (X3DObject)xmlLoader.toX3dObjectTree(document);
X3D0.toFileX3D("./nashorn/examples/Java.x3d");
}
}
Here’s how you compile it:
javac -cp jars/X3DJSAIL.3.3.full.jar";"classes nashorn/examples/Java.java
Here’s how you run it:
java -cp jars/X3DJSAIL.3.3.full.jar";"classes";"nashorn/examples Java
I can’t get a similar program with just X3DJSAIL to do the same thing, but I have this program:
load('nashorn/node/X3Dautoclass.js');
var X3DLoaderObject = Java.type("org.web3d.x3d.jsail.X3DLoaderObject")
var x3dLoader = new X3DLoaderObject();
x3dLoader.loadModelFromFileX3D("./nashorn/examples/HelloWorldProgramOutput.x3d");
if (x3dLoader.isLoadSuccessful())
{
document = x3dLoader.getDomDocument();
var xmlLoader = new X3DLoaderObject();
var X3D0 = xmlLoader.toX3dObjectTree(document);
X3D0.toFileX3D("./nashorn/examples/X3d.x3d");
}
Which doesn’t have the error. There must be some difference in the DOM. Do we have a DOM differencing tool we can use?
Again, here is the error being thrown:
[X3DLoaderObject error] Incorrectly handled object construction, current elementObject=ViewpointGroup (ViewpointGroup), child=Viewpoint, java.lang.ClassCastException: org.web3d.x3d.jsail.Navigation.ViewpointGroupObject cannot be cast to org.web3d.x3d.sai.Grouping.X3DGroupingNode
java.lang.ClassCastException: org.web3d.x3d.jsail.Navigation.ViewpointGroupObject cannot be cast to org.web3d.x3d.sai.Grouping.X3DGroupingNode
at org.web3d.x3d.jsail.X3DLoaderObject.toX3dObjectTree(X3DLoaderObject.java:1146)
at org.web3d.x3d.jsail.X3DLoaderObject.toX3dObjectTree(X3DLoaderObject.java:542)
at org.web3d.x3d.jsail.X3DLoaderObject.toX3dObjectTree(X3DLoaderObject.java:542)
at org.web3d.x3d.jsail.X3DLoaderObject.toX3dObjectTree(X3DLoaderObject.java:430)
at org.web3d.x3d.jsail.X3DLoaderObject.toX3dObjectTree(X3DLoaderObject.java:399)
at Java.main(Java.java:15)
[X3DLoaderObject error] Incorrectly handled object construction, current elementObject=ViewpointGroup (ViewpointGroup), child=Viewpoint, java.lang.ClassCastException: org.web3d.x3d.jsail.Navigation.ViewpointGroupObject cannot be cast to org.web3d.x3d.sai.Grouping.X3DGroupingNode
java.lang.ClassCastException: org.web3d.x3d.jsail.Navigation.ViewpointGroupObject cannot be cast to org.web3d.x3d.sai.Grouping.X3DGroupingNode
at org.web3d.x3d.jsail.X3DLoaderObject.toX3dObjectTree(X3DLoaderObject.java:1146)
at org.web3d.x3d.jsail.X3DLoaderObject.toX3dObjectTree(X3DLoaderObject.java:542)
at org.web3d.x3d.jsail.X3DLoaderObject.toX3dObjectTree(X3DLoaderObject.java:542)
at org.web3d.x3d.jsail.X3DLoaderObject.toX3dObjectTree(X3DLoaderObject.java:430)
at org.web3d.x3d.jsail.X3DLoaderObject.toX3dObjectTree(X3DLoaderObject.java:399)
at Java.main(Java.java:15)
It looks like ViewpointGroupObject is not an X3DGroupingNode, so we need another “else if” case before the final case where the error is thrown. Or just get rid of the X3DGroupingNode cast.
I don’t know why the X3DJSAIL version which doesn’t load JSON doesn’t throw the error. That is still a mystery.
John
Sent from Mail for Windows 10
From: Don Brutzman
Sent: Wednesday, June 6, 2018 6:20 PM
To: John Carlson
Cc: x3d-public at web3d.org
Subject: Re: X3DJSAIL, X3dToJava.xslt and DOM X3DLoaderObjecttesting:anotherClassCastException
Hmmm. Likely it is your version John, just checked and we have a working round-trip "smoke test" for this construct.
http://www.web3d.org/specifications/java/X3DJSAIL.html#Examples
Excerpts in the examples/ directory, presented in order of production:
1. HelloWorldProgram.java
// ========== More object declarations, some with DEF values ==========
String defaultViewpointDEF = "DefaultView";
String topDownViewpointDEF = "TopDownView";
ViewpointGroupObject viewpointGroup = new ViewpointGroupObject(); // requires <component name='Navigation' level='3'/>
ViewpointObject defaultViewpoint = new ViewpointObject(defaultViewpointDEF);
ViewpointObject topDownViewpoint = new ViewpointObject(topDownViewpointDEF);
2. HelloWorldProgramOutput.x3d
<ViewpointGroup description='Available viewpoints'>
<Viewpoint DEF='DefaultView' description='Hello X3DJSAIL'/>
<Viewpoint DEF='TopDownView' description='top-down view from above' orientation='1 0 0 -1.570796' position='0 100 0'/>
</ViewpointGroup>
3. Ant build.xml in stylesheets/ parent directory:
<echo message="==========================================="/>
<echo message="org.web3d.x3d.jsail.CommandLine java/examples/HelloWorldProgramOutput.x3d -toZIP -toFile ${java.examples.dir}/HelloWorldProgramOutput.ant.zip"/>
<java classname="org.web3d.x3d.jsail.CommandLine" classpath="${java.jars.dir}/${jsai.full.archive.jar.name};." fork="${fork}">
<arg value="${java.examples.dir}/HelloWorldProgramOutput.x3d"/><!-- input model -->
<arg value="-toZIP"/>
<arg value="-toFile"/>
<arg value="${java.examples.dir}/HelloWorldProgramOutput.ant.zip"/>
</java>
<echo message="==========================================="/>
4. HelloWorldProgramOutputLog.txt
===========================================
org.web3d.x3d.jsail.CommandLine java/examples/HelloWorldProgramOutput.x3d -toZIP -toFile java/examples/HelloWorldProgramOutput.ant.zip
parameter: source file HelloWorldProgramOutput.x3d filesize 20956 bytes, parsed using Document Object Model (DOM) X3DLoader
parameter: "-toZIP" for conversion to compressed ZIP containing model
parameter: "-toFile" "java/examples/HelloWorldProgramOutput.ant.zip" for result file name root java/examples/HelloWorldProgramOutput.ant
convert to ZIP:
source: java/examples/HelloWorldProgramOutput.x3d filesize 20956 bytes
result: HelloWorldProgramOutput.ant.zip filesize 5574 bytes, compression 26.60% of original
===========================================
5. HelloWorldProgramOutput.ReloadedDOM.x3d
<ViewpointGroup description='Available viewpoints'>
<Viewpoint DEF='DefaultView' description='Hello X3DJSAIL'/>
<Viewpoint DEF='TopDownView' description='top-down view from above' orientation='1 0 0 -1.570796' position='0 100 0'/>
</ViewpointGroup>
so in this case, YMMV likely indicates that you need an update.
On 6/6/2018 2:37 PM, John Carlson wrote:
> Try stepping through with these commands at command prompt or similar (you’ll have to use diff and cp from Ubuntu, now available on Windows or similar commands under DOS)
>
> $ cd /c/x3d-code/www.web3d.org/x3d/stylesheets/java/
>
> $ javac -cp lib/javax.json-api-1.0.jar src/net/coderextreme/X3DJSONLD.java
>
> $ cp src/net/coderextreme/X3DJSONLD.class classes/net/coderextreme/
>
> $ jjs -cp "jars/X3DJSAIL.3.3.full.jar;classes" nashorn/examples/Json.js # you may have to use the Java 8 way of specifying the classpath. See build.xml
>
> $ diff -w nashorn/examples/HelloWorldProgramOutput.Java.x3d nashorn/examples/Json.x3d
>
> 32a33,35
>
> > <meta name='translated' content='27 May 2018'/>
>
> > <meta name='generator' content='X3dToJson.xslt, http://www.web3d.org/x3d/stylesheets/X3dToJson.html'/>
>
> > <meta name='reference' content='X3D JSON encoding: http://www.web3d.org/wiki/index.php/X3D_JSON_Encoding'/>
>
> 35,38c38
>
> < <ViewpointGroup description='Available viewpoints'>
>
> < <Viewpoint DEF='DefaultView' description='Hello X3DJSAIL'/>
>
> < <Viewpoint DEF='TopDownView' description='top-down view from above' orientation='1 0 0 -1.570796' position='0 100 0'/>
>
> < </ViewpointGroup>
>
> ---
>
> > <ViewpointGroup description='Available viewpoints'/>
>
> You will see the missing Viewpoint’s (children of ViewpointGroup) as above. Also jjs will generate significant output.
>
> I can’t connect through svn, so I may be out of date.
>
> John
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10
>
> *From: *Don Brutzman <mailto:brutzman at nps.edu>
> *Sent: *Wednesday, June 6, 2018 9:41 AM
> *To: *John Carlson <mailto:yottzumm at gmail.com>
> *Cc: *x3d-public at web3d.org <mailto:x3d-public at web3d.org>
> *Subject: *Re: X3DJSAIL, X3dToJava.xslt and DOM X3DLoaderObject testing:anotherClassCastException
>
> 1. Hi John, finally getting back to this one.
>
> On 4/30/2018 3:15 PM, John Carlson wrote:
>
> > Previously reported problem, now assigned to the X3DLoaderObject, I believe.
>
> >
>
> > No Viewpoint children in X3D or JSON output.
>
> Not sure what that means? Viewpoint node typically does not have any children, except perhaps for a Metadata* node or an IS/connect.
>
> > Is a problem with X3DLoaderObject, looks like another class cast exception. X3DJSONLD was eliminated from the problem by printing out the DOM object, and verifying the Viewpoint objects were there. See x3d-code/www.web3d.org/x3d/stylesheets/java/nashorn/examples/Quotes.js.
>
> >
>
> > Can be regenerated by running `ant test.nashorn` in x3d-code/www.web3d.org/x3d/stylesheets/java
>
> >
>
> > See output in nashorn/examples/Json.{json,x3d}
>
> >
>
> > John
>
> OK have recently updated to Java JDK 1.8.0_172 and adjusted PATH to confirm jjs is running OK.
>
> Have also synchronized X3DJSAIL sudirectory nashorn/ and contents with subversion.
>
> I get the following outputs when running test.nashorn build target:
>
> ============================================================
>
> ant -f E:\\x3d-code\\www.web3d.org\\x3d\\stylesheets\\java test.nashorn
>
> test.nashorn:
>
> ===========================================
>
> ant nashorn/build.xml test.nashorn
>
> X3D Nashorn SAI Library.test.nashorn:
>
> Compile:
>
> Compiling 1 source file to E:\x3d-code\www.web3d.org\x3d\stylesheets\java\classes
>
> Compiling 1 source file to E:\x3d-code\www.web3d.org\x3d\stylesheets\java\classes
>
> Copy:
>
> Copying 1 file to E:\x3d-code\www.web3d.org\x3d\stylesheets\java\nashorn\examples
>
> Copying E:\x3d-code\www.web3d.org\x3d\stylesheets\java\examples\HelloWorldProgramOutput.x3d to E:\x3d-code\www.web3d.org\x3d\stylesheets\java\nashorn\examples\HelloWorldProgramOutput.x3d
>
> Copying 1 file to E:\x3d-code\www.web3d.org\x3d\stylesheets\java\nashorn\examples
>
> Copying E:\x3d-code\www.web3d.org\x3d\stylesheets\java\examples\HelloWorldProgramOutput.json to E:\x3d-code\www.web3d.org\x3d\stylesheets\java\nashorn\examples\HelloWorldProgramOutput.json
>
> Run:
>
> parameter: source file HelloWorldProgramOutput.x3d filesize 20956 bytes, parsed using Document Object Model (DOM) X3DLoader
>
> parameter: "-tojs" for conversion to X3DJSONLD JavaScript source
>
> parameter: "-toFile" "nashorn/examples/HelloWorldProgramOutput.Nashorn.js" for result file name root nashorn/examples/HelloWorldProgramOutput.Nashorn
>
> convert to JS JavaScript:
>
> Warning: toFileJavaScript() is overwriting prior file nashorn/examples/HelloWorldProgramOutput.Nashorn.js
>
> Script DEF=colorTypeConversionScript contains CDATA source-code text, copied as "#sourceText" using "strings" mode
>
> Script DEF=MaterialModulatorScript contains CDATA source-code text, copied as "#sourceText" using "strings" mode
>
> TypeError: input.readAllBytes is not a function
>
> Error: Cannot read file [E:\x3d-code\www.web3d.org\x3d\stylesheets\java\nashorn\node_modules\xmldom\package.json]:
>
> [Error] TODO problem handling local exception within CommandLine, exiting
>
> org.web3d.x3d.sai.X3DException: ScriptException when processing fileName nashorn\examples\HelloWorldProgramOutput.Nashorn.js.intermediate.js, unable to save result: javax.script.ScriptException: Error: Cannot load JSON file in nashorn/jvm-npm.js at line number 216 at column number 8
>
> at org.web3d.x3d.jsail.Core.X3DObject.toFileJavaScript(X3DObject.java:1662)
>
> at org.web3d.x3d.jsail.CommandLine.run(CommandLine.java:628)
>
> at org.web3d.x3d.jsail.CommandLine.main(CommandLine.java:163)
>
> parameter: source file HelloWorldProgramOutput.x3d filesize 20956 bytes, parsed using Document Object Model (DOM) X3DLoader
>
> parameter: "-toJSON" for conversion to JSON encoding
>
> parameter: "-toFile" "nashorn/examples/HelloWorldProgramOutput.Java.json" for result file name root nashorn/examples/HelloWorldProgramOutput.Java
>
> convert to JSON:
>
> Warning: toFileStylesheetConversion(X3dToJson.xslt) is overwriting prior file nashorn/examples/HelloWorldProgramOutput.Java.json
>
> Script DEF=colorTypeConversionScript contains CDATA source-code text, copied as "#sourceText" using "strings" mode
>
> Script DEF=MaterialModulatorScript contains CDATA source-code text, copied as "#sourceText" using "strings" mode
>
> file conversion successful: HelloWorldProgramOutput.Java.json (39749 bytes)
>
> parameter: source file HelloWorldProgramOutput.x3d filesize 20956 bytes, parsed using Document Object Model (DOM) X3DLoader
>
> parameter: "-toX3D" for conversion to X3D encoding
>
> parameter: "-toFile" "nashorn/examples/HelloWorldProgramOutput.Java.x3d" for result file name root nashorn/examples/HelloWorldProgramOutput.Java
>
> convert to X3D:
>
> Warning: toFileX3D() is overwriting prior file nashorn/examples/HelloWorldProgramOutput.Java.x3d
>
> file conversion successful: HelloWorldProgramOutput.Java.x3d (20956 bytes)
>
> ===========================================
>
> ============================================================
>
> As you can see, the exception is in nashorn/jvm-npm.js:
>
> TypeError: input.readAllBytes is not a function
>
> Header in that file indicates that you have modified it.
>
> Specific javascript code block of interest:
>
> function readFile (filename, core) {
>
> var input;
>
> try {
>
> if (core) {
>
> var classloader = java.lang.Thread.currentThread().getContextClassLoader();
>
> input = classloader.getResourceAsStream(filename);
>
> } else {
>
> input = new java.io.FileInputStream(filename);
>
> }
>
> return new java.lang.String(input.readAllBytes());
>
> } catch (e) {
>
> System.err.println(e);
>
> throw new ModuleError('Cannot read file [' + filename + ']: ', 'IO_ERROR', e);
>
> }
>
> }
>
> JDK 8 Javadoc for java.io.FileInputStream does not provide a "readAllBytes()" method. (Nor does JDK 1.9; however I am currently holding at 1.8 to stay compatible with Netbeans 8.)
>
> https://docs.oracle.com/javase/8/docs/api/java/io/FileInputStream.html
>
> So it looks like you need another method.
>
> A search for "java.io.FileInputStream readAllBytes" provides a number of hits. For example:
>
> File to byte[] in Java
>
> https://stackoverflow.com/questions/858980/file-to-byte-in-java
>
> 2. Continuing with your prior error console also appears fruitful:
>
> > [exec] [X3DLoaderObject error] Incorrectly handled object construction, current elementObject=ViewpointGroup (ViewpointGroup), child=Viewpoint, java.lang.ClassCastException: org.web3d.x3d.jsail.Navigation.ViewpointGroupObject cannot be cast to org.web3d.x3d.sai.Grouping.X3DGroupingNode
>
> >
>
> > [exec] java.lang.ClassCastException: org.web3d.x3d.jsail.Navigation.ViewpointGroupObject cannot be cast to org.web3d.x3d.sai.Grouping.X3DGroupingNode
>
> >
>
> > [exec] at org.web3d.x3d.jsail.X3DLoaderObject.toX3dObjectTree(X3DLoaderObject.java:1146)
>
> >
>
> > [exec] at org.web3d.x3d.jsail.X3DLoaderObject.toX3dObjectTree(X3DLoaderObject.java:542)
>
> >
>
> > [exec] at org.web3d.x3d.jsail.X3DLoaderObject.toX3dObjectTree(X3DLoaderObject.java:542)
>
> >
>
> > [exec] at org.web3d.x3d.jsail.X3DLoaderObject.toX3dObjectTree(X3DLoaderObject.java:430)
>
> >
>
> > [exec] at org.web3d.x3d.jsail.X3DLoaderObject.toX3dObjectTree(X3DLoaderObject.java:399)
>
> >
>
> > [exec] at jdk.scripting.nashorn.scripts/jdk.nashorn.internal.scripts.Script$Recompilation$372$Json$cu1$restOf.:program(nashorn/examples/Json.js:15)
>
> >
>
> > [exec] at jdk.scripting.nashorn/jdk.nashorn.internal.runtime.ScriptFunctionData.invoke(ScriptFunctionData.java:655)
>
> >
>
> > [exec] at jdk.scripting.nashorn/jdk.nashorn.internal.runtime.ScriptFunction.invoke(ScriptFunction.java:513)
>
> >
>
> > [exec] at jdk.scripting.nashorn/jdk.nashorn.internal.runtime.ScriptRuntime.apply(ScriptRuntime.java:527)
>
> >
>
> > [exec] at jdk.scripting.nashorn/jdk.nashorn.tools.Shell.apply(Shell.java:519)
>
> >
>
> > [exec] at jdk.scripting.nashorn/jdk.nashorn.tools.Shell.runScripts(Shell.java:448)
>
> >
>
> > [exec] at jdk.scripting.nashorn/jdk.nashorn.tools.Shell.run(Shell.java:186)
>
> >
>
> > [exec] at jdk.scripting.nashorn.shell/jdk.nashorn.tools.jjs.Main.main(Main.java:104)
>
> >
>
> > [exec] at jdk.scripting.nashorn.shell/jdk.nashorn.tools.jjs.Main.main(Main.java:80)
>
> Looks like it was trying to treat ViewpointGroup like a X3DGroupingNode - but it is not. ViewpointGroup is not a X3DGroupingNode node, and can only contain a Metadata* node, Viewpoint/OrthoViewpoint/GeoViewpoint and other ViewpointGroup nodes.
>
> This might have been fixed already as part of the many DOM loader improvements performed; not seeing that error in my console. Worth retesting if you can address the readAllBytes issue.
>
> I've added a warning to X3D tooltips to clarify that.
>
> Hope next round of improvement/testing can sort this one out fully.
all the best, Don
--
Don Brutzman Naval Postgraduate School, Code USW/Br brutzman at nps.edu
Watkins 270, MOVES Institute, Monterey CA 93943-5000 USA +1.831.656.2149
X3D graphics, virtual worlds, navy robotics http://faculty.nps.edu/brutzman
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