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Difficulty with Octave's "javaMethod"

In this question, I was trying to import java classes into Octave. In my particular example, I was (and am) working with javaplex, a set of java tools with code for implementation in Matlab. The answer to the question shows that, whereas in Matlab you would do the following:
import edu.stanford.math.plex4.*;
api.Plex4.createExplicitSimplexStream();
The answer provided in the question showed that the way to do this in Octave is
javaMethod( 'createExplicitSimplexStream', 'edu.stanford.math.plex4.api.Plex4')
This was working excellently, but then I ran into a strange problem. There is another method called createVietorisRipsStream. In Matlab, I would run this with a line such as the following:
api.Plex4.createVietorisRipsStream(parameters);
So I would think that the equivalent command in Octave would be
javaMethod( 'createVietorisRipsStream', 'edu.stanford.math.plex4.api.Plex4')
However, when I do this, I get the following error:
error: [java] java.lang.NoSuchMethodException: createVietorisRipsStream
I'm not sure why this error is coming up, and both are in the same JAVA file ('Plex4'). I did take a look at the Plex4 file, and there are two differences between createExplicitSimplexStream and createVietorisRipsStream that I noticed:
There are two instances of createExplicitSimplexStream and six instances of createVietorisRipsStream
There is bit that says <double[]>. I don't know if that is relevant however (I haven't read or wrote much java, up to this point, I've been able to use the tutorial they provided to only use Matlab and not have to look under the hood).
Here is one example of the code from the Plex4 file for a createExplicitSimplexStream:
public static ExplicitSimplexStream createExplicitSimplexStream(double maxFiltrationValue) {
return new ExplicitSimplexStream(maxFiltrationValue);
}
Here is one example of the code from the Plex4 file for a createVietorisRipsStream:
public static VietorisRipsStream<double[]> createVietorisRipsStream(double[][] points, int maxDimension, double maxFiltrationValue, int numDivisions) {
return FilteredStreamInterface.createPlex4VietorisRipsStream(points, maxDimension, maxFiltrationValue, numDivisions);
}
Any idea of why I'm getting the error I'm getting?

Read the octave documentation for the Java section properly, it's only 4 pages, and it explains this well!
As I mentioned in the comments in the previous question, the way to call a java method with arguments is:
javamethod(
name of method as a string,
name of class fully qualified with packages as a string,
method's first argument,
method's second argument,
... etc
)
This is the only way to call 'static' methods; with normal 'instance' methods, you can either use javaMethod and replace the name of the class by the java object itself, or simply use it as you would in java, i.e. objectname.methodname(arg1, arg2, ... etc)
I have implemented here the tutorial for you to have a look at (page 14 in the pdf). (don't forget to run the modified 'load_javaplex' script first).
octave:2> max_dimension = 3;
octave:3> max_filtration_value = 4;
octave:4> num_divisions = 1000;
octave:5> point_cloud = javaMethod( 'getHouseExample', 'edu.stanford.math.plex4.examples.PointCloudExamples')
point_cloud =
<Java object: double[][]>
octave:6> stream = javaMethod( 'createVietorisRipsStream', 'edu.stanford.math.plex4.api.Plex4', point_cloud, max_dimension, max_filtration_value, num_divisions)
stream =
<Java object: edu.stanford.math.plex4.streams.impl.VietorisRipsStream>
octave:7> persistence = javaMethod( 'getModularSimplicialAlgorithm', 'edu.stanford.math.plex4.api.Plex4', max_dimension, 2)
persistence =
<Java object: edu.stanford.math.plex4.autogen.homology.IntAbsoluteHomology>
octave:8> intervals = persistence.computeIntervals(stream)
intervals =
<Java object: edu.stanford.math.plex4.homology.barcodes.BarcodeCollection>
(I have not gone further because plot_barcodes needs to be modified a bit too; it's only a couple of lines but it would be too much to post here, the reasoning is the same though).
Also, if you're not sure what is meant by class constructors, class methods, and static vs instance-specific methods, unfortunately this is more to do with java, although it should be pretty introductory stuff. It is well worth reading up a bit about it first.
Good luck!

How to pass Table Field as import parameter to SAP RFC using JAVA(JCO3)

Following i my code in JCO3.0 to connect to RFC and get the data from function module:
try {
JCoDestination destination = JCoDestinationManager.getDestination(DESTINATION_NAME);
JCoFunction function = destination.getRepository().getFunction("funtion_abap");
***function.getImportParameterList().setValue("IM_ID_NAME", "MTC_ZPR008_TEMPB");***
function.execute(destination);
JCoTable table = function.getTableParameterList().getTable("export_table");
}
catch(Exception e){
}
Following is my ABAP function:
CALL FUNCTION 'funtion_abap' DESTINATION m_vsyid
EXPORTING
IM_ID_NAME = table_vname
IMPORTING
export_table = table_tvarvc
EXCEPTIONS
system_failure = 1
communication_failure = 2
resource_failure = 3
OTHERS = 4.
following is an error m getting while passing String as import parameter while it wants Table field as import parameter:
Exception in thread "main" com.sap.conn.jco.ConversionException: (122) JCO_ERROR_CONVERSION: Cannot convert a value of 'MTC_ZPR008_TEMPB' from type java.lang.String to TABLE at field IM_ID_NAME
at com.sap.conn.jco.rt.AbstractRecord.createConversionException(AbstractRecord.java:468)
at com.sap.conn.jco.rt.AbstractRecord.createConversionException(AbstractRecord.java:462)
at com.sap.conn.jco.rt.AbstractRecord.setValue(AbstractRecord.java:2958)
at com.sap.conn.jco.rt.AbstractRecord.setValue(AbstractRecord.java:4074)
at com.amgen.rfc.RFC_Connection.main(RFC_Connection.java:47)
Please tell me how to solve this problem.

The RFC definition and your code are in direct opposition. According to the ABAP function (as far as I read it) the result of the call is the value in field IM_ID_NAME and the table is the input parameter.
I'm not 100% familiar with the declaration of RFCs in ABAP (I only know the Java side of it), but if I interpret the error message correctly, the table seems to be in the input parameter list rather than the table parameter list (not usual but not never seen before, either). So instead of getTableParameterList you will possible have to call getInputParameterList. Also you should omit the setting of the field IM_ID_NAME because that's the response value and resides in the output parameter list.

I know the question is quite old but someone may find my response useful one day since I had the same problem:
JcoTable tab = function.getImportParameterList().getTable("IM_ID_NAME");
tab.appendRow();
tab.firstRow(); // I'm not sure if this is actually reqiured
tab.setValue("PARAM_NAME", paramValue);

how to further debug to expose the values in the element in groovy script

Hi i am new to groovy and i have an issue that i am facing. Currently i am trying to see the values inside typeCache[alias] which seems to be a hashtable.
protected static Hashtable typeCache = new Hashtable();
logger.error "this is type cache : " + typeCache[alias].get(indx)[1];
when i output the element i get the following result in the logs :-
this is type cache : [com.abcd.util.TypeElement#5dc97ce, com.abcd.util.TypeElement#270a8a6, com.abcd.util.TypeElement#5d421487]
am i able to expose further on the elements to see what is in them and what is it doing ?? i am used to php programming and usually in situations such as this i would do a var_dump is there an equivalent of var_dump in groovy ??
thank you.

Each object has a method, which generates a
public String dump()
Generates a detailed dump string of an object showing its class, hashCode and fields. http://docs.groovy-lang.org/latest/html/groovy-jdk/java/lang/Object.html#dump%28%29
This post contains an example, but make sure to read the comment, as the answer is not corrected as of yet.

Calling methods between groovy scripts with correct parameters

I just started learning about groovy and trying to transpose my java code to groovy scripts. Usually java allows you have a class with only methods that you can call from other classes. I wanted to translate that to groovy. I have in one file - lets call it File1- a method like this:
def retrieveData(String name){
// do something
}
and in the second file, File2, I call File1 like this:
def file1Class = this.class.classLoader.parseClass(new File("../File1.groovy"))
and then try to call the method in File1 like this:
def data = file1Class.retrieveData("String")
but it keeps giving me this error - MissingMethodException:
groovy.lang.MissingMethodException: No signature of method: static File1.retrieveData() is applicable for argument types: (java.lang.String) values: [String] Possible solutions: retrieveData(java.lang.String)
so it does recognize that I am sending in the correct number of parameters and even the correct object, but it isn't running the method as it should?
Is there something I am missing? I tried to remove the object definition from the method - in other words - like this:
def retrieveData(name){
// do something
}
but that didn't work either. I am clueless about what the next step would be. Can anyone please help push me in the right direction? I would greatly appreciate it.

See the answer provided in this StackOverflow reponse.
Use the GroovyScriptEngine class. What does the GroovyScriptEngine do? From the docs:
Specific script engine able to reload modified scripts as well as
dealing properly with dependent scripts.
See the example below.
def script = new GroovyScriptEngine( '.' ).with {
loadScriptByName( '..\File1.groovy' )
}
this.metaClass.mixin script
retrieveData()
Note how we use the loadScriptByNamemethod to
Get the class of the scriptName in question, so that you can
instantiate Groovy objects with caching and reloading.
This will allow you to access Groovy objects from files however you please.

adding function to jsonjava object and calling it from xpages control

I am trying to add a function to a JSONJavaObject and calling it from a control on an xpage.
so far I have:
json = (JsonJavaObject) JsonParser.fromJson(factory, colJson);
String func = "function () { alert('you clicked?'); }";
json.put("onClick", new JsonReference(func) );
In the first line I add key-value pairs from a column in a Notes view.
In the second line I define the function as a string.
In the last line I place the converted string as function in the jsonjava object.
I read about this in the following blog post:
http://camerongregor.com/2016/01/19/doublequoteavoidance/
In the next step I bind the function to e.g. a button control as followed:
<xp:button value="Label" id="button1">
<xp:eventHandler event="onclick" submit="false">
<xp:this.script><![CDATA[obj.onClick]]></xp:this.script>
</xp:eventHandler>
</xp:button>
obj is the respresentation of the JSONJava object in SSJS.
But without success. Anyone know how I can call the function in the object?

I hope I will make sense here, let me know if anything to clarify.
If you are simply trying to dynamically output the client side script of a button event, then you don't need to use JsonReference at all. You can just use a String.
In my blog article I might not have make it clear why I needed to use JsonReference. I was using it in the process of rendering a custom UIComponent, part of this process required generating a Json object client side. To do this I created the JsonJavaObject as you did and then asked it to be turned into a string with the 'toJson' method. My problem was that when I asked the whole object to become a string, every property of that object that was a String, would begin and end with a double quote. I needed to ensure that the properties which were intended to be functions did not begin and end with "". By using the JsonReference the JsonGenerator became aware of my intention not to include these double quotes.
In your case, it looks as though you are just trying to dynamically determine what happens with onClick. To do this you could simply use a String instead of the JsonReference. The inclusion of the 'function() {}' is unnecessary as this will be generated when the event handler is rendered at the end of the page.
For Example here would be the Json Java Object
JsonJavaObject obj = new JsonJavaObject();
String func = " alert('you clicked?'); ";
obj.put("onClick", func);
return obj;
And here would be the button:
<xp:button id="button1" value="Alert Me">
<xp:eventHandler event="onclick" submit="false"
script="#{javascript: myBean.myObject.get('onClick')}">
</xp:eventHandler>
</xp:button>
This should give you the end result of seeing 'you clicked?' alert.
You can also inspect how this has all been generated in the script block near the end of the page using 'view Source' or your favourite web browser developer tools:
function view__id1__id2_clientSide_onclick(thisEvent) {
alert('you clicked?');
}
XSP.addOnLoad(function() {
XSP.attachEvent("view:_id1:_id2", "view:_id1:button1", "onclick",
view__id1__id2_clientSide_onclick, false, 2);
});
Let me know if anything isn't clear, hope it helps!

Does obj.onClick already give you a handle to the function returned by the Java class? If it does then you should be able to call it using the call or apply methods that are available in JavaScript:
obj.onClick.call();
obj.onClick.apply();
More details about those two methods can be found here: What is the difference between call and apply?