Issue #14877: drop java 14 build

Author: strkkk

.ci/validation.sh

@@ -536,21 +536,6 @@ javac11)
   done
   ;;
 
-javac14)
-  files=($(grep -Rl --include='*.java' ': Compilable with Java14' \
-        src/test/resources-noncompilable \
-        src/xdocs-examples/resources-noncompilable || true))
-  if [[  ${#files[@]} -eq 0 ]]; then
-    echo "No Java14 files to process"
-  else
-      mkdir -p target
-      for file in "${files[@]}"
-      do
-        javac --release 14 --enable-preview -d target "${file}"
-      done
-  fi
-  ;;
-
 javac17)
   files=($(grep -Rl --include='*.java' ': Compilable with Java17' \
         src/test/resources-noncompilable \

.circleci/config.yml

@@ -266,10 +266,6 @@ workflows:
       - validate-with-script:
           name: "javac11"
           command: "./.ci/validation.sh javac11"
-      - validate-with-script:
-          name: "javac14"
-          image-name: "cimg/openjdk:14.0.2"
-          command: "./.ci/validation.sh javac14"
       - validate-with-script:
           name: "javac17"
           image-name: "cimg/openjdk:17.0.5"

src/it/resources-noncompilable/com/google/checkstyle/test/chapter5naming/rule526parameternames/InputRecordComponentName.java

@@ -1,4 +1,4 @@
-//non-compiled with javac: Compilable with Java14
+//non-compiled with javac: Compilable with Java17
 package com.puppycrawl.tools.checkstyle.checks.naming.recordcomponentname;
 
 /* Config:

src/it/resources-noncompilable/com/google/checkstyle/test/chapter5naming/rule527localvariablenames/InputPatternVariableNameEnhancedInstanceofTestDefault.java

@@ -1,7 +1,7 @@
-//non-compiled with javac: Compilable with Java14
+//non-compiled with javac: Compilable with Java17
 package com.google.checkstyle.test.chapter5naming.rule527localvariablenames;
 
-import java.util.ArrayList;
+import java.util.*;
 import java.util.Locale;
 
 public class InputPatternVariableNameEnhancedInstanceofTestDefault {
@@ -42,7 +42,7 @@ public void t(Object o1, Object o2) {
         }
         b = ((VoidPredicate) () -> o1 instanceof String s).get();
 
-        ArrayList<Integer> arrayList = new ArrayList<Integer>();
+        List<Integer> arrayList = new ArrayList<Integer>();
         if (arrayList instanceof ArrayList<Integer> ai) {
             System.out.println("Blah");
         }

src/it/resources-noncompilable/com/google/checkstyle/test/chapter5naming/rule528typevariablenames/InputRecordTypeParameterName.java

@@ -1,4 +1,4 @@
-//non-compiled with javac: Compilable with Java14
+//non-compiled with javac: Compilable with Java17
 package com.puppycrawl.tools.checkstyle.checks.naming.recordtypeparametername;
 
 import java.io.Serializable;

src/it/resources-noncompilable/org/checkstyle/suppressionxpathfilter/covariantequals/InputXpathCovariantEqualsInRecord.java

@@ -1,4 +1,4 @@
-//non-compiled with javac: Compilable with Java14
+//non-compiled with javac: Compilable with Java17
 
 package org.checkstyle.suppressionxpathfilter.covariantequals;
 

src/it/resources-noncompilable/org/checkstyle/suppressionxpathfilter/illegalidentifiername/InputXpathIllegalIdentifierNameOne.java

@@ -1,4 +1,4 @@
-//non-compiled with javac: Compilable with Java14
+//non-compiled with javac: Compilable with Java17
 package org.checkstyle.suppressionxpathfilter.illegalidentifiername;
 
 /* Config:

src/it/resources-noncompilable/org/checkstyle/suppressionxpathfilter/illegalidentifiername/InputXpathIllegalIdentifierNameTwo.java

@@ -1,4 +1,4 @@
-//non-compiled with javac: Compilable with Java14
+//non-compiled with javac: Compilable with Java17
 package org.checkstyle.suppressionxpathfilter.illegalidentifiername;
 
 /* Config:

src/it/resources-noncompilable/org/checkstyle/suppressionxpathfilter/patternvariablename/InputXpathPatternVariableNameFour.java

@@ -1,4 +1,4 @@
-//non-compiled with javac: Compilable with Java14
+//non-compiled with javac: Compilable with Java17
 package com.puppycrawl.tools.checkstyle.checks.naming;
 
 public class InputXpathPatternVariableNameFour {

src/it/resources-noncompilable/org/checkstyle/suppressionxpathfilter/patternvariablename/InputXpathPatternVariableNameOne.java

@@ -1,4 +1,4 @@
-//non-compiled with javac: Compilable with Java14
+//non-compiled with javac: Compilable with Java17
 package com.puppycrawl.tools.checkstyle.checks.naming;
 
 public class InputXpathPatternVariableNameOne {