Interface Import Java to Delphi

[Jan_Florian_Siems]

This issue occuring now for a few days, i dont have any idea or solution yet.
I started toying with netbeans for a few days in order to test switching from Eclipse.
After finishing my research I installed last version of Eclipse Eclipse IDE for Enterprise Java Developers - 2020-03. The issue occurs in Hydra Version 6.2.101.1239 and also in Version 6.2.101.1243. I guess it will also happen in Stable version (untested since importer had a bug with code generator in delphi).

I use OpenJDK from JDK 13 Releases for running eclipse. As JRE-Compiler in Eclipse i tried JDK13.0.2 64-Bit, JRE 8.0.241 32-Bit (in order to test if its the issue). Hydra in Delphi points towards JRE 8.0.241 32-Bit. I´ve written a new test plugin in order to test some performance with json requests but also tried to import the previous displayed Java Plugin this threads :

Feeling like running towards a wall over and over and over. (Java\Delphi)

Yes i will do. Also add all required steps how i use it, what i do and so on. Will take a bit to prepare.

Communication 32\64 Bit Host\Plugin

Hello community, still thinking about this topic also another thing came to my mind. In december we once also discussed Hydra Java Plugin Interface in Delphi. Being in urge of designing an architecture for future modules i found https://adoptopenjdk.net/. They seem to be able to build 32-Bit OpenJDK version but they arent supported by latest Eclipse. I hoped we could use this and then load JVM with 32 bit in order to import written interfaces to delphi. I guess those 2 topics are going hand in…

Hydra Java Plugin Interface in Delphi

I just thought i share some wisdom i obtained recently. This still not means there is no need for a 64-Bit Java wrapper but it can help for now as workaround to resolve Issues. You can get 32\64 Bit OpenJDK through https://adoptopenjdk.net/. I installed x86 version as Hotspot and x64 as OpenJ version (same not possible through their installshieldshield kit). I can run Eclipse Version: 2019-09 R (4.13.0) without any issues. as Systemenvirement i used C:\Program Files (x86)\AdoptOpenJDK\jdk-13.0…

So i believe my written sample should be working.

Any ideas?

[EvgenyK (Evgeny Karpov)]

Hi,

can you send your plugin to support@ for investigation, pls?
you can remove all code from java methods

[Jan_Florian_Siems]

Good morning @EvgenyK,

You still should have that mail from my other post. If you already deleted it, i can resend it again.
There were no special code in my new plugin aside that i added a function

public string performRequest(String Value){
return “Test”;
}

I were toying with building JSON based Requests and send them towards Plugin.

[EvgenyK (Evgeny Karpov)]

Hi,

I’ve added performRequest method and Java importer works w/o any issues.
it generated code like

function TPluginImplementationWrapper.PerformRequest(arg0: UnicodeString): UnicodeString;
var
  lmethodId: JMethodID;
  largs: JValueDynArray;
begin
  lmethodId := Self.JVM.Reflection.GetMethodId(Self.ClassID, 'performRequest', '(Ljava/lang/String;)Ljava/lang/String;');
  System.SetLength(largs, 1);
  largs[0] := Self.JVM.ValueConverter.ConvertFromString(arg0);
  result := Self.JVM.ValueConverter.ConvertToString(Self.JVM.Reflection.CallObjectMethod(Self.InstanceID, lmethodId, largs));
  exit;
end;

I can attach .jar here or sent it to you via PM.

[Jan_Florian_Siems]

Send it to me via pn please. I like to test if it works on my side then (then i need to clarify whats wrong on code). If it doesnt work it could be something special in the envirement. Do i need Visual Studio installed? I uninstalled it last week.

[EvgenyK (Evgeny Karpov)]

done.
you don’t need VS