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How to correctly develop, upload java library with dependencies to Oracle DB and call my Java function from PL\SQL?

I have:
Oracle 19c
java 8 on its machine
What i did:
I write simple class with one method in Java 8.
package <mypackage>;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.networknt.schema.JsonSchema;
import com.networknt.schema.JsonSchemaFactory;
import com.networknt.schema.SpecVersion;
import com.networknt.schema.ValidationMessage;
import java.io.IOException;
import java.io.Reader;
import java.sql.Clob;
import java.sql.SQLException;
import java.util.Set;
import java.util.stream.Collectors;
public class <classname> {
<some simple validation function>
}
I compile my project with maven and maven-assembly-plugin to build .jar file with dependencies.
I upload it with loadtool: loadjava -f -r -v -synonym -oracleresolver -resolve -grant <user> -thin -user <credentials> <filename>.jar
There were 0 errors during upload. All uploaded classes (including dependencies) have 'VALID' status in dba_objects table.
I write PL/SQL wrapper over my Java function.
create FUNCTION <funcname>(P_IN_BODY_TEXT CLOB, P_IN_BODY_SCHEMA_TEXT CLOB)
RETURN VARCHAR2
AS LANGUAGE JAVA NAME '<packagename>.<classname>.<funcname>(java.sql.Clob, java.sql.Clob) return java.lang.String';
/
I use this function in my ORDS REST Service.
When doing request to ORDS i am getting this exception:
The request could not be processed because an error occurred whilst attempting to evaluate
the SQL statement associated with this resource.
Please check the SQL statement is correctly formed and executes without error. SQL Error Code: 29532,
Error Message: ORA-29532: Java call terminated by uncaught Java exception:
java.lang.NoClassDefFoundError ORA-06512: at <rest stacktrace that gives me nothing>
Quiestion is:
What is root of this problem? By -synonym flag tool creates synonyms for me, all classes is valid. Do i need some permisions to use java packages liike java.sql that in my class imports? I upload some others open sources java libraries into my Oracle, but they doesn't hava dependencies - is that the problem?

Problem was in slf4j library that throws this exception. slf4j was dependency of library that i used.
Didn't dig the problem, I just pick another labrary with less dependencies and its works.

Having difficulties in java trying to use an external jar file

I'm using java version 11 in Ubuntu and I'm having trouble using pipes for input/output of data. Because of the pipes I can't use the Netbeans IDE. I use the terminal instead.
The question is if I HAVE to use the Princeton specific I/O or if system I/O will work. Specifically it is choice between
BinaryStdOut.write(i);
BinaryStdOut.write(' ');
//System.out.print(i);
//System.out.print(' ');
If I comment out the Princeton BinaryStdOut and use System.out, everything works perfectly on my local machine. I use
java MoveToFront - < abra.txt
However when I send the code to the grader, it fails to print the results so that the grader thinks there are no results. If I uncomment their code and comment out the System.out, I get an error saying that it can't find the jar file.
java MoveToFront - < abra.txt
Exception in thread "main" java.lang.NoClassDefFoundError: edu/princeton/cs/algs4/BinaryStdOut
at MoveToFront.encode(MoveToFront.java:31)
at MoveToFront.main(MoveToFront.java:67)
Caused by: java.lang.ClassNotFoundException: edu.princeton.cs.algs4.BinaryStdOut
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:581)
I have put MoveToFront.class and algs4.jar in the same folder because I understand the default classpath is the same folder as the class file.
This morning I found on stackoverflow that one should mention the specific jar file, so I changed my command accordingly. It shows definite improvement but not enough.
java -cp "algs4.jar" MoveToFront - < abra.txt
Error: Could not find or load main class MoveToFront
Caused by: java.lang.ClassNotFoundException: MoveToFront
Obviously there is a main class in MoveToFront as it worked perfectly well with System.out. Apparently I am almost there, but I am still missing something important. The question is what??
Just to be complete the main is
public static void main(String[] args) {
if (args[0].equals("-")) encode();
if (args[0].equals("+")) decode();
}

sun.misc.InvalidJarIndexException: Invalid index when importing from com.* package in Jython standalone

I'm getting an InvalidJarIndexException when trying to utilize Jython standalone JAR inside my application and I'm unable to figure out what I'm doing wrong.
As soon as I attempt to execute a Python script with an import statement for any Java class from a package starting with "com.", e.g.: "com.foo.Bar", the following exception is thrown (truncated):
Traceback (most recent call last):
File "<string>", line 1, in <module>
sun.misc.InvalidJarIndexException: Invalid index
at sun.misc.URLClassPath$JarLoader.getResource(URLClassPath.java:1152)
at sun.misc.URLClassPath$JarLoader.getResource(URLClassPath.java:1062)
at sun.misc.URLClassPath$JarLoader.findResource(URLClassPath.java:1032)
at sun.misc.URLClassPath.findResource(URLClassPath.java:225)
at java.net.URLClassLoader$2.run(URLClassLoader.java:572)
at java.net.URLClassLoader$2.run(URLClassLoader.java:570)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findResource(URLClassLoader.java:569)
at java.lang.ClassLoader.getResource(ClassLoader.java:1089)
at java.net.URLClassLoader.getResourceAsStream(URLClassLoader.java:233)
at org.python.core.ClasspathPyImporter.tryClassLoader(ClasspathPyImporter.java:221)
at org.python.core.ClasspathPyImporter.makeEntry(ClasspathPyImporter.java:208)
at org.python.core.ClasspathPyImporter.makeEntry(ClasspathPyImporter.java:18)
at org.python.core.util.importer.getModuleInfo(importer.java:174)
at org.python.core.util.importer.importer_find_module(importer.java:98)
at org.python.core.ClasspathPyImporter.ClasspathPyImporter_find_module(ClasspathPyImporter.java:134)
at org.python.core.ClasspathPyImporter$ClasspathPyImporter_find_module_exposer.__call__(Unknown Source)
at org.python.core.PyBuiltinMethodNarrow.__call__(PyBuiltinMethodNarrow.java:48)
at org.python.core.imp.find_module(imp.java:761)
at org.python.core.imp.import_next(imp.java:1158)
at org.python.core.imp.import_module_level(imp.java:1350)
at org.python.core.imp.importName(imp.java:1528)
at org.python.core.ImportFunction.__call__(__builtin__.java:1285)
at org.python.core.PyObject.__call__(PyObject.java:433)
at org.python.core.__builtin__.__import__(__builtin__.java:1232)
at org.python.core.imp.importOneAs(imp.java:1564)
at org.python.pycode._pyx0.f$0(<string>:1)
at org.python.pycode._pyx0.call_function(<string>)
at org.python.core.PyTableCode.call(PyTableCode.java:173)
at org.python.core.PyCode.call(PyCode.java:18)
at org.python.core.Py.runCode(Py.java:1687)
at org.python.core.Py.exec(Py.java:1731)
at org.python.util.PythonInterpreter.exec(PythonInterpreter.java:268)
at com.so.Script.execute(Script.java:20)
Here's all I'm doing in my code (I'm actually invoking this via a Swing action on a JMenuItem calling new Script().execute(), which is most likely irrelevant):
package com.so;
import org.python.core.PyDictionary;
import org.python.core.PySystemState;
import org.python.util.PythonInterpreter;
public class Script {
public Script() {
}
public void execute() {
PyDictionary table = new PyDictionary();
PySystemState state = new PySystemState();
PythonInterpreter interp = new PythonInterpreter(table, state);
String script;
script = "" +
"import com.foo.Bar as Bar\n" +
"";
interp.exec(script);
}
}
It doesn't even matter that there is no such package/class in my classpath. But what baffles me the most is that when I, thinking this has to be classpath related, created a separate mock project with the exact same classpath (same JAR files from the same locations on disk), the other project works just fine when run and it executes the actual script.
What could I be doing wrong here?
This happens with Java 1.8u241 (x64) and both jython-standalone-2.7.2.jar and an earlier 2.7.1 version. The ClassLoader in the stack trace is attempting to resolve "com".

I found the culprit entirely by accident.
My broken project used an older (ancient) version of the Glazed Lists library, namely glazedlists-1.8.0_java15.jar. This JAR seems to be directly incompatible with jython-standalone-2.7.2.jar. As soon as you put them on the same classpath and attempt to execute a python script, which imports any Java package starting with "com.", you end up with an InvalidJarIndexException. Updating to a newer version of said JAR resolved the issue.
Therefore, if you encounter a similar exception trying to run Jython, I suggest you update all dependencies of your project to latest or newer versions of them. In fact this would probably be the solution, even if not using Jython at all.

Unable to add watch expressions in eclipse

I am using Eclipse based development environment - a Groovy/Grails Tool Suite. The issue seems to be that eclipse is not able to find some JARs. And I dont understand where to put those JARs. Below are the details.
I am trying to step through the code. However when I put watch on any variable it gives error, but the same variable evaluates correctly on Variables window. I did one obeservation, that when there are a lot of expressions in my Expressions window, the debugger slows down, it takes time to evaluate those expressions but gives error for all. When I remove all expressions it steps through without any slow down. Also similar error occur when I use Display window
Below is the screen shot of whats happening
I checked the eclipse error log file. There are many errors, but below seems to be relevant one:
!ENTRY org.grails.ide.eclipse.groovy.debug.core 4 0 2015-08-19 12:40:09.963
!MESSAGE Internal error logged from Groovy Core Debug:
!STACK 0
java.lang.Exception: (Groovy) Complete snippet:
/////start
import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.TimeUnit;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
println it
/////end
at org.grails.ide.eclipse.groovy.debug.core.evaluation.GroovyJDIEvaluator.performEvaluate(GroovyJDIEvaluator.java:202)
at org.grails.ide.eclipse.groovy.debug.core.evaluation.GroovyJDIEvaluator$1$1.run(GroovyJDIEvaluator.java:160)
at org.eclipse.jdt.internal.debug.core.model.JDIThread.runEvaluation(JDIThread.java:764)
at org.grails.ide.eclipse.groovy.debug.core.evaluation.GroovyJDIEvaluator$1.run(GroovyJDIEvaluator.java:165)
at org.eclipse.jdt.internal.debug.core.model.JDIThread$ThreadJob.run(JDIThread.java:3157)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:54)
Caused by: org.codehaus.groovy.control.MultipleCompilationErrorsException: startup failed:
____Eval.groovy: 8: unable to resolve class org.slf4j.Logger
# line 8, column 18.
import org.slf4j.Logger;
^
____Eval.groovy: 9: unable to resolve class org.slf4j.LoggerFactory
# line 9, column 18.
import org.slf4j.LoggerFactory;
^
2 errors
at org.codehaus.groovy.control.ErrorCollector.failIfErrors(ErrorCollector.java:313)
at org.codehaus.groovy.control.CompilationUnit.applyToSourceUnits(CompilationUnit.java:1040)
at org.codehaus.groovy.control.CompilationUnit.doPhaseOperation(CompilationUnit.java:647)
at org.codehaus.groovy.control.CompilationUnit.compile(CompilationUnit.java:596)
at groovy.lang.GroovyClassLoader.doParseClass(GroovyClassLoader.java:279)
at groovy.lang.GroovyClassLoader.parseClass(GroovyClassLoader.java:258)
at org.grails.ide.eclipse.groovy.debug.core.evaluation.GroovyJDIEvaluator.convertSnippetToScript(GroovyJDIEvaluator.java:349)
at org.grails.ide.eclipse.groovy.debug.core.evaluation.GroovyJDIEvaluator.performEvaluate(GroovyJDIEvaluator.java:183)
... 5 more
Seems like it needs some jars, but which and where to put them? I tried adding the file slf4j-api-1.7.2.jar which contains these classes to %JAVA_HOME%/lib and %JAVA_HOME%\jre\lib and also to ggts' plugins folder, but it did not helped.

Java issue NoClassDefFound javax.xml.soap.SOAPPart

I have been given a java app to modify with the following:
import javax.xml.soap.MessageFactory;
import javax.xml.soap.SOAPException;
import javax.xml.soap.SOAPMessage;
import javax.xml.soap.SOAPPart;
But When I run it from cmd it throws the error:
Exception in thread "main" java.lang.NoClassDefFoundError:
org/apache/axis/SOAPP art
It seems to find the other imports without issue. Does 'NoClassDefFound' mean the class itself wasn't found? If so how can I check it is there and replace it if not? (I am using Eclipse)
Update: Okay I have found the class in 'JRE System Library>rt.jar>javax.xml.soap>SOAPPart.class' So if the class is there why do I get the error?

Turns out I needed to choose Export> 'Runnable JAR file' in eclipse instead of 'JAR file'