Replaced swagger2markup maven plugin with openapi-generator

Makefile

@@ -50,17 +50,19 @@ release_package: java_package
 docu_html: docu_htmlclean docu_check
 	mkdir -p documentation/html
 	$(CP) -vrL documentation/book/images documentation/html/images
-	asciidoctor -v --failure-level WARN -t -dbook -a ProductVersion=$(RELEASE_VERSION) documentation/book/bridge.adoc -o documentation/html/bridge.html
+	# override snippetDir for asciidoctor to get right path to the snippets
+	asciidoctor -v --failure-level WARN -t -dbook -a ProductVersion=$(RELEASE_VERSION) -a snippetDir=${PWD}/documentation/book/api/snippet/ documentation/book/bridge.adoc -o documentation/html/bridge.html
 
 .PHONY: docu_htmlnoheader
 docu_htmlnoheader: docu_htmlnoheaderclean docu_check
 	mkdir -p documentation/htmlnoheader
 	$(CP) -vrL documentation/book/images documentation/htmlnoheader/images
-	asciidoctor -v --failure-level WARN -t -dbook -a ProductVersion=$(RELEASE_VERSION) -s documentation/book/bridge.adoc -o documentation/htmlnoheader/bridge.html
+	# override snippetDir for asciidoctor to get right path to the snippets
+	asciidoctor -v --failure-level WARN -t -dbook -a ProductVersion=$(RELEASE_VERSION) -a snippetDir=${PWD}/documentation/book/api/snippet/ -s documentation/book/bridge.adoc -o documentation/htmlnoheader/bridge.html
 
 .PHONY: docu_api
 docu_api: 
-	mvn $(MVN_ARGS) -P apidoc io.github.swagger2markup:swagger2markup-maven-plugin:convertSwagger2markup@generate-apidoc
+	mvn $(MVN_ARGS) -P apidoc org.openapitools:openapi-generator-maven-plugin:generate@generate-apidoc
 
 .PHONY: docu_check
 docu_check: docu_api

documentation/book/api/.openapi-generator-ignore

@@ -0,0 +1,23 @@
+# OpenAPI Generator Ignore
+# Generated by openapi-generator https://github.com/openapitools/openapi-generator
+
+# Use this file to prevent files from being overwritten by the generator.
+# The patterns follow closely to .gitignore or .dockerignore.
+
+# As an example, the C# client generator defines ApiClient.cs.
+# You can make changes and tell OpenAPI Generator to ignore just this file by uncommenting the following line:
+#ApiClient.cs
+
+# You can match any string of characters against a directory, file or extension with a single asterisk (*):
+#foo/*/qux
+# The above matches foo/bar/qux and foo/baz/qux, but not foo/bar/baz/qux
+
+# You can recursively match patterns against a directory, file or extension with a double asterisk (**):
+#foo/**/qux
+# This matches foo/bar/qux, foo/baz/qux, and foo/bar/baz/qux
+
+# You can also negate patterns with an exclamation (!).
+# For example, you can ignore all files in a docs folder with the file extension .md:
+#docs/*.md
+# Then explicitly reverse the ignore rule for a single file:
+#!docs/README.md

documentation/book/api/.openapi-generator/FILES

@@ -0,0 +1 @@
+index.adoc

documentation/book/api/.openapi-generator/VERSION

@@ -0,0 +1 @@
+7.8.0

documentation/book/api/.openapi-generator/openapi.json-generate-apidoc.sha256

@@ -0,0 +1 @@
+e4a70d99cdac5e8dddb45ce30c39817fa9402463074478e0fd3a05d6a7f849d5