upgrade java

Dockerfile

@@ -1,5 +1,5 @@
 # build base image
-FROM maven:3-jdk-8-alpine as maven
+FROM maven:3-openjdk-11-slim as maven
 
 # copy pom.xml
 COPY ./pom.xml ./pom.xml
@@ -24,7 +24,7 @@ WORKDIR /
 RUN mvn package
 
 # final base image
-FROM openjdk:8u171-jre-alpine
+FROM openjdk:11-jre-slim
 
 # set deployment directory
 WORKDIR /mod-camunda

Jenkinsfile

@@ -1,7 +1,5 @@
-
 buildMvn {
   publishAPI = 'no'
   mvnDeploy = 'yes'
-  runLintRamlCop = 'no'
+  buildNode = 'jenkins-agent-java11'
 }
-

codestyles-suppressions.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0"?>
+
+<!DOCTYPE suppressions PUBLIC
+    "-//Puppy Crawl//DTD Suppressions 1.1//EN"
+    "http://checkstyle.sourceforge.net/dtds/suppressions_1_1.dtd">
+
+<suppressions>
+  <!-- Tone down the checking for test code -->
+  <suppress checks="ImportControl"     files=".*[\\/]src[\\/](test|it)[\\/]"/>
+  <suppress checks="Javadoc"           files=".*[\\/]src[\\/](test|it)[\\/]"/>
+  <suppress checks="MagicNumber"       files=".*[\\/]src[\\/](test|it)[\\/]"/>
+  <suppress checks="AvoidStaticImport" files=".*[\\/]src[\\/](test|it)[\\/]"/>
+  <suppress checks="WriteTag"          files=".*[\\/]src[\\/](test|it)[\\/]"/>
+  <suppress checks="MethodCount"       files=".*[\\/]src[\\/](test|it)[\\/]"/>
+  <suppress checks="."                 files="[\\/]generated-sources[\\/]"/>
+</suppressions>

codestyles.xml

@@ -0,0 +1,58 @@
+<?xml version="1.0" ?>
+<!DOCTYPE module PUBLIC
+    "-//Puppy Crawl//DTD Check Configuration 1.3//EN"
+    "http://checkstyle.sourceforge.net/dtds/configuration_1_3.dtd">
+
+<module name="Checker">
+  <property name="fileExtensions" value="java, xml, json, properties" />
+  <module name="NewlineAtEndOfFile">
+    <property name="lineSeparator" value="lf"/>
+  </module>
+  <module name="FileTabCharacter">
+    <property name="eachLine" value="true"/>
+  </module>
+  <module name="TreeWalker">
+    <module name="EmptyStatement"/>
+    <property name="tabWidth" value="2" />
+    <module name="AvoidStarImport" />
+    <module name="EmptyBlock" />
+    <module name="MethodLength">
+      <property name="tokens" value="METHOD_DEF" /> <!-- max lines for a function -->
+      <property name="max" value="200" />
+      <property name="countEmpty" value="false"/>
+    </module>
+    <module name="MethodLength">
+      <property name="tokens" value="CTOR_DEF" /> <!-- max lines for a constructor -->
+      <property name="max" value="20" />
+    </module>
+    <module name="AnonInnerLength">
+      <property name="max" value="30"/> <!-- max lines for inner class / lambda - note java spec = 20 -->
+    </module>
+    <module name="AvoidInlineConditionals"/> <!--  Some developers find inline conditionals hard to read -->
+    <module name="AvoidStaticImport"> <!-- avoid static imports as they are confusing, allow the list included below -->
+      <property name="excludes" value="java.lang.System.out,java.lang.Math.*"/>
+    </module>
+    <module name="ClassDataAbstractionCoupling"> <!-- the number of instantiations of other classes within the given class -->
+      <property name="max" value="10"/>
+      <!-- since cannot pass RMB generated objects as a package with wildcard, thershold may be exceeded, changing this to warning -->
+      <property name="severity" value="warning"/>
+    </module>
+    <module name="ConstantName"> <!-- Validates identifiers for constants (static, final fields).  -->
+      <property name="format" value="^log(ger)?|[A-Z][A-Z0-9]*(_[A-Z0-9]+)*$"/>
+    </module>
+    <module name="DeclarationOrder"/> <!-- Class (static) variables, instance vars, constructors, methods -->
+    <module name="EmptyCatchBlock"> <!-- Checks for empty catch blocks,
+                                except is  if exception's variable name is expected or ignore or there's any comment inside: -->
+      <property name="exceptionVariableName" value="expected|ignore"/>
+    </module>
+    <module name="VisibilityModifier"> <!-- Checks visibility of class members, allow package visibility of class members that are not
+                                static final, immutable or annotated by specified annotation members may be public -->
+      <property name="packageAllowed" value="true"/>
+    </module>
+    <module name="StaticVariableName"/> <!-- Validates identifiers for static, non-final fields. ^[a-z][a-zA-Z0-9]*$ -->
+    <module name="TypeName" /> <!-- Validates identifiers for classes, interfaces, enums, and annotations.  -->
+    <module name="SuppressWarningsHolder" /> <!-- provide @SuppressWarnings annotations -->
+  </module>
+  <module name="SuppressWarningsFilter" />   <!-- filter using @SuppressWarnings annotations -->
+</module>
+

pom.xml

@@ -34,9 +34,6 @@
   <packaging>jar</packaging>
 
   <properties>
-    <java.version>1.8</java.version>
-    <maven.compiler.source>${java.version}</maven.compiler.source>
-    <maven.compiler.target>${java.version}</maven.compiler.target>
     <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <camunda.version>7.12.0</camunda.version>
     <camunda.spring.boot.version>3.4.0</camunda.spring.boot.version>