Issue #14877: drop unsupported java version builds from CI

.ci/validation.sh

@@ -551,36 +551,6 @@ javac14)
   fi
   ;;
 
-javac15)
-  files=($(grep -Rl --include='*.java' ': Compilable with Java15' \
-        src/test/resources-noncompilable \
-        src/xdocs-examples/resources-noncompilable || true))
-  if [[  ${#files[@]} -eq 0 ]]; then
-    echo "No Java15 files to process"
-  else
-      mkdir -p target
-      for file in "${files[@]}"
-      do
-        javac --release 15 --enable-preview -d target "${file}"
-      done
-  fi
-  ;;
-
-javac16)
-  files=($(grep -Rl --include='*.java' ': Compilable with Java16' \
-        src/test/resources-noncompilable \
-        src/xdocs-examples/resources-noncompilable || true))
-  if [[  ${#files[@]} -eq 0 ]]; then
-    echo "No Java16 files to process"
-  else
-      mkdir -p target
-      for file in "${files[@]}"
-      do
-        javac --release 16 --enable-preview -d target "${file}"
-      done
-  fi
-  ;;
-
 javac17)
   files=($(grep -Rl --include='*.java' ': Compilable with Java17' \
         src/test/resources-noncompilable \

.circleci/config.yml

@@ -270,14 +270,6 @@ workflows:
           name: "javac14"
           image-name: "cimg/openjdk:14.0.2"
           command: "./.ci/validation.sh javac14"
-      - validate-with-script:
-          name: "javac15"
-          image-name: "cimg/openjdk:15.0.2"
-          command: "./.ci/validation.sh javac15"
-      - validate-with-script:
-          name: "javac16"
-          image-name: "cimg/openjdk:16.0.2"
-          command: "./.ci/validation.sh javac16"
       - validate-with-script:
           name: "javac17"
           image-name: "cimg/openjdk:17.0.5"

src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/checks/design/finalclass/InputFinalClassNestedStaticClassInsideInnerClass.java

@@ -4,7 +4,7 @@
 
 */
 
-//non-compiled with javac: Compilable with Java16
+//non-compiled with javac: Compilable with Java17
 package com.puppycrawl.tools.checkstyle.checks.design.finalclass;
 
 public class InputFinalClassNestedStaticClassInsideInnerClass {

src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/checks/indentation/indentation/InputIndentationCheckSwitchExpressionNewLine.java

@@ -1,4 +1,4 @@
-//non-compiled with javac: Compilable with Java15                                   //indent:0 exp:0
+//non-compiled with javac: Compilable with Java17                                   //indent:0 exp:0
 package com.puppycrawl.tools.checkstyle.checks.indentation.indentation;             //indent:0 exp:0
                                                                                   //indent:82 exp:82
 /* Config:                                                                          //indent:0 exp:0

src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/checks/javadoc/javadoctype/InputJavadocTypeRecordParamDescriptionWithAngularTags.java

@@ -4,7 +4,7 @@
 
 */
 
-//non-compiled with javac: Compilable with Java16
+//non-compiled with javac: Compilable with Java17
 package com.puppycrawl.tools.checkstyle.checks.javadoc.javadoctype;
 
 /**

src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/checks/javadoc/missingjavadocmethod/InputMissingJavadocMethod1.java

@@ -5,7 +5,7 @@
 
 */
 
-//non-compiled with javac: Compilable with Java15
+//non-compiled with javac: Compilable with Java17
 package com.puppycrawl.tools.checkstyle.checks.javadoc.missingjavadocmethod;
 
 public class InputMissingJavadocMethod1 {

src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/checks/modifier/modifierorder/InputModifierOrderSealedAndNonSealed.java

@@ -4,7 +4,7 @@
 
 */
 
-//non-compiled with javac: Compilable with Java15
+//non-compiled with javac: Compilable with Java17
 package com.puppycrawl.tools.checkstyle.checks.modifier.modifierorder;
 // violation below ''public' modifier out of order with the JLS suggestions.'
 sealed public class InputModifierOrderSealedAndNonSealed

src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/checks/modifier/modifierorder/InputModifierOrderSealedAndNonSealedNoViolation.java

@@ -4,7 +4,7 @@
 
 */
 
-//non-compiled with javac: Compilable with Java15
+//non-compiled with javac: Compilable with Java17
 package com.puppycrawl.tools.checkstyle.checks.modifier.modifierorder;
 
 public sealed class InputModifierOrderSealedAndNonSealedNoViolation

src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/checks/modifier/redundantmodifier/InputRedundantModifierRecords.java

@@ -6,7 +6,7 @@
 
 package com.puppycrawl.tools.checkstyle.checks.modifier.redundantmodifier;
 
-//non-compiled with javac: Compilable with Java16
+//non-compiled with javac: Compilable with Java17
 public class InputRedundantModifierRecords {
 
     static record testRecord(int a) { // violation 'Redundant 'static' modifier'

src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/checks/uncommentedmain/InputUncommentedMainBeginTree2.java

@@ -4,7 +4,7 @@
 
 */
 
-//non-compiled with javac: Compilable with Java16
+//non-compiled with javac: Compilable with Java17
 package com.puppycrawl.tools.checkstyle.checks.uncommentedmain;
 
 public record InputUncommentedMainBeginTree2(Integer x) {

src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/checks/uncommentedmain/InputUncommentedMainRecords2.java

@@ -5,7 +5,7 @@
 
 */
 
-//non-compiled with javac: Compilable with Java16
+//non-compiled with javac: Compilable with Java17
 package com.puppycrawl.tools.checkstyle.checks.uncommentedmain;
 
 public record InputUncommentedMainRecords2(Integer x) {

src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/grammar/antlr4/InputAntlr4AstRegressionJava15FinalLocalRecord.java

@@ -1,4 +1,4 @@
-//non-compiled with javac: Compilable with Java15
+//non-compiled with javac: Compilable with Java17
 package com.puppycrawl.tools.checkstyle.grammar.antlr4;
 
 public class InputAntlr4AstRegressionJava15FinalLocalRecord {

src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/grammar/antlr4/InputAntlr4AstRegressionJava16LocalEnumAndInterface.java

@@ -1,4 +1,4 @@
-//non-compiled with javac: Compilable with Java16
+//non-compiled with javac: Compilable with Java17
 package com.puppycrawl.tools.checkstyle.grammar.antlr4;
 
 public class InputAntlr4AstRegressionJava16LocalEnumAndInterface {

src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/grammar/antlr4/InputAntlr4AstRegressionUncommon.java

@@ -1,4 +1,4 @@
-//non-compiled with javac: Compilable with Java16
+//non-compiled with javac: Compilable with Java17
 package com.puppycrawl.tools.checkstyle.grammar.antlr4;
 
 import java.io.Serializable;

src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/grammar/antlr4/InputAntlr4AstRegressionUncommon3.java

@@ -1,4 +1,4 @@
-//non-compiled with javac: Compilable with Java16
+//non-compiled with javac: Compilable with Java17
 package com.puppycrawl.tools.checkstyle.grammar.antlr4;
 
 public class InputAntlr4AstRegressionUncommon3 implements AutoCloseable {

src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/grammar/java15/InputAstRegressionSealedAndPermits.java

@@ -1,4 +1,4 @@
-//non-compiled with javac: Compilable with Java15
+//non-compiled with javac: Compilable with Java17
 package com.puppycrawl.tools.checkstyle.grammar.java15;
 
 public sealed class InputAstRegressionSealedAndPermits permits Circle, Square, Rectangle {

src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/grammar/java15/InputTopLevelNonSealed.java

@@ -1,4 +1,4 @@
-//non-compiled with javac: Compilable with Java15
+//non-compiled with javac: Compilable with Java17
 package com.puppycrawl.tools.checkstyle.grammar.java15;
 
 public non-sealed class InputTopLevelNonSealed extends OtherClass {

src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/grammar/java16/InputPatternVariableWithModifiers.java

@@ -1,4 +1,4 @@
-//non-compiled with javac: Compilable with Java16
+//non-compiled with javac: Compilable with Java17
 package com.puppycrawl.tools.checkstyle.grammar.java16;
 
 public class InputPatternVariableWithModifiers {

src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/javaparser/InputJavaParserFullJavaIdentifierSupport.java

@@ -1,4 +1,4 @@
-//non-compiled with javac: Compilable with Java15
+//non-compiled with javac: Compilable with Java17
 package com.puppycrawl.tools.checkstyle.javaparser;
 
 public class InputJavaParserFullJavaIdentifierSupport {

src/test/resources-noncompilable/com/puppycrawl/tools/checkstyle/javaparser/InputJavaParserNoFreezeOnDeeplyNestedLambdas.java

@@ -1,4 +1,4 @@
-//non-compiled with javac: Compilable with Java16
+//non-compiled with javac: Compilable with Java17
 package com.puppycrawl.tools.checkstyle.javaparser;
 
 import java.util.concurrent.Callable;

src/test/resources/com/puppycrawl/tools/checkstyle/grammar/antlr4/ExpectedAntlr4AstRegressionJava15FinalLocalRecord.txt

@@ -1,6 +1,6 @@
 COMPILATION_UNIT -> COMPILATION_UNIT [2:0]
 |--SINGLE_LINE_COMMENT -> // [1:0]
-|   `--COMMENT_CONTENT -> non-compiled with javac: Compilable with Java15\n [1:2]
+|   `--COMMENT_CONTENT -> non-compiled with javac: Compilable with Java17\n [1:2]
 |--PACKAGE_DEF -> package [2:0]
 |   |--ANNOTATIONS -> ANNOTATIONS [2:47]
 |   |--DOT -> . [2:47]

src/test/resources/com/puppycrawl/tools/checkstyle/grammar/antlr4/ExpectedAntlr4AstRegressionUncommon.txt

@@ -1,6 +1,6 @@
 COMPILATION_UNIT -> COMPILATION_UNIT [2:0]
 |--SINGLE_LINE_COMMENT -> // [1:0]
-|   `--COMMENT_CONTENT -> non-compiled with javac: Compilable with Java16\n [1:2]
+|   `--COMMENT_CONTENT -> non-compiled with javac: Compilable with Java17\n [1:2]
 |--PACKAGE_DEF -> package [2:0]
 |   |--ANNOTATIONS -> ANNOTATIONS [2:47]
 |   |--DOT -> . [2:47]

src/test/resources/com/puppycrawl/tools/checkstyle/grammar/antlr4/ExpectedAntlr4AstRegressionUncommon3.txt

@@ -1,6 +1,6 @@
 COMPILATION_UNIT -> COMPILATION_UNIT [2:0]
 |--SINGLE_LINE_COMMENT -> // [1:0]
-|   `--COMMENT_CONTENT -> non-compiled with javac: Compilable with Java16\n [1:2]
+|   `--COMMENT_CONTENT -> non-compiled with javac: Compilable with Java17\n [1:2]
 |--PACKAGE_DEF -> package [2:0]
 |   |--ANNOTATIONS -> ANNOTATIONS [2:47]
 |   |--DOT -> . [2:47]