Issues when importing WSDL files into Web Service Consumer

Recently I faced up with WSDL which I couldn't import into Web Service Consumer. Our consumer worked well from last 5 years but it is a long period and during that time our Service Provider was updated a lot so we decided to update our Consumer as well. Guess everything went fine?

No WSDL was returned from the URL

I simply created new Consumer in Domino Designer, set URL to our WSDL, picked Java and clicked OK. Oops...

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Domino Designer
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No WSDL was returned from the URL:
https://api.ourserver.com/secure/api1/WebService?WSDL
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OK
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The requested operation failed: no import files

Wow, thought I :) let's try to import WSDL as Lotus Script then (just to see if it is not related to Java)

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IBM Domino Designer
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The requested operation failed: no import files
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OK   
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Name too long

Hey, what? This WSDL is used by many another applications without any issues, what is going on!? I downloaded WSDL as file to my local PC and tried to import it as Lotus Script again. This time it went fine (except issues with Name too long). Well, great news anyway, at least everything works when WSDL is a local file.

The Web Service implementation code generated from the provided WSDL could not be compiled, so no design element was created

Ok, it worked for Lotus Script, let's set now Java...

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IBM Domino Designer
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The Web Service implementation code generated from the provided WSDL could not be compiled, so no design element was created.  Please correct the WSDL and try again.  The errors are located in the following file:: C:\Users\dpa\AppData\Local\Temp\notes90C43B\47238811.err
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OK   
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OK, it's time to blame Designer and IBM! Why it is so difficult just to import WSDL? All another application that use WSDL from our server did not have such issues. It's just not fair :). Found a file with error and quite typical line: java.lang.OutOfMemoryError: Java heap space. I knew what to do, I increased HTTPJVMMaxHeapSize and JavaMaxHeapSize to 512M, restarted Designer/Notes and tried again. Worked well! I restored original values to HTTPJVMMaxHeapSize and JavaMaxHeapSize after that.

The system is out of resources.
Consult the following stack trace for details.
java.lang.OutOfMemoryError: Java heap space
at com.sun.tools.javac.util.Position$LineMapImpl.build(Position.java:151)
at com.sun.tools.javac.util.Position.makeLineMap(Position.java:75)
at com.sun.tools.javac.parser.Scanner.getLineMap(Scanner.java:1117)
at com.sun.tools.javac.main.JavaCompiler.parse(JavaCompiler.java:524)
at com.sun.tools.javac.main.JavaCompiler.parse(JavaCompiler.java:562)
at com.sun.tools.javac.main.JavaCompiler.parseFiles(JavaCompiler.java:816)
at com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:739)
at com.sun.tools.javac.main.Main.compile(Main.java:365)
at com.sun.tools.javac.main.Main.compile(Main.java:291)
at com.sun.tools.javac.main.Main.compile(Main.java:282)
at com.sun.tools.javac.Main.compile(Main.java:99)
at lotus.notes.internal.IDEHelper.compile(Unknown Source)

Simple thing however it costed few hours for me. Hope it will save some time for other people.