Miscellaneous cleanups for supporting JDK 18

build.gradle

@@ -55,21 +55,15 @@ ext {
 // Keep in sync with check in
 // framework/src/main/java/org/checkerframework/framework/source/SourceChecker.java .
 switch (JavaVersion.current()) {
-    case JavaVersion.VERSION_1_9:
-    case JavaVersion.VERSION_1_10:
-    case JavaVersion.VERSION_12:
-    case JavaVersion.VERSION_19:
-    case JavaVersion.VERSION_20:
-        logger.note("The Checker Framework has only been tested with JDK 8, 11, 17, and 18." +
-                " You are using JDK " + JavaVersion.current().majorVersion + ".");
-        break;
     case JavaVersion.VERSION_1_8:
     case JavaVersion.VERSION_11:
     case JavaVersion.VERSION_17:
     case JavaVersion.VERSION_18:
         break; // Supported versions
     default:
-        throw new GradleException("Unexpected Java version found: " + JavaVersion.current().majorVersion);
+        logger.info("The Checker Framework has only been tested with JDK 8, 11, 17, and 18." +
+                " You are using JDK " + JavaVersion.current().majorVersion + ".");
+        break;
 }
 
 task setLocalRepo(type:Exec) {

checker/bin-devel/build.sh

@@ -12,6 +12,7 @@ echo "CHECKERFRAMEWORK=$CHECKERFRAMEWORK"
 export SHELLOPTS
 echo "SHELLOPTS=${SHELLOPTS}"
 
+echo "initial JAVA_HOME=${JAVA_HOME}"
 if [ "$(uname)" == "Darwin" ] ; then
   export JAVA_HOME=${JAVA_HOME:-$(/usr/libexec/java_home)}
 else

checker/tests/fenum/UpperBoundsInByteCode.java

@@ -1,4 +1,4 @@
-// @above-java17-jdk-skip-test TODO: reinstate on JDK 18, false positives may be due to issue #979
+// @above-java17-jdk-skip-test TODO: reinstate, false positives may be due to issue #979
 
 import org.checkerframework.checker.fenum.qual.Fenum;
 import org.checkerframework.framework.testchecker.lib.UncheckedByteCode;

checker/tests/mustcall/CommandResponse.java

@@ -1,6 +1,6 @@
 // Based on a false positive in Zookeeper.
 
-// @above-java17-jdk-skip-test TODO: reinstate on JDK 18, false positives may be due to issue #979
+// @above-java17-jdk-skip-test TODO: reinstate, false positives may be due to issue #979
 
 import java.util.Map;
 

checker/tests/nullness/Issue3754.java

@@ -1,4 +1,4 @@
-// @above-java17-jdk-skip-test TODO: reinstate on JDK 18, false positives may be due to issue #979
+// @above-java17-jdk-skip-test TODO: reinstate, false positives may be due to issue #979
 
 import org.checkerframework.checker.nullness.qual.Nullable;
 

checker/tests/nullness/Iterate.java

@@ -1,4 +1,4 @@
-// @above-java17-jdk-skip-test TODO: reinstate on JDK 18, false positives may be due to issue #979
+// @above-java17-jdk-skip-test TODO: reinstate, false positives may be due to issue #979
 
 package wildcards;
 

checker/tests/nullness/RawTypesNullness.java

@@ -1,4 +1,4 @@
-// @above-java17-jdk-skip-test TODO: reinstate on JDK 18, false negatives may be due to issue #979
+// @above-java17-jdk-skip-test TODO: reinstate, false negatives may be due to issue #979
 
 import org.checkerframework.checker.nullness.qual.Nullable;
 

checker/tests/nullness/java8inference/Issue980.java

@@ -1,7 +1,7 @@
 // Test case that was submitted in Issue 402, but was combined with Issue 979
 // https://github.com/typetools/checker-framework/issues/979
 
-// @above-java17-jdk-skip-test TODO: reinstate on JDK 18, false positives may be due to issue #979
+// @above-java17-jdk-skip-test TODO: reinstate, false positives may be due to issue #979
 
 import java.util.List;
 import java.util.stream.Collectors;

docs/manual/inference.tex

@@ -238,10 +238,10 @@
 \item The project on which inference is run must contain an Ant, Gradle,
   or Maven buildfile that compiles the project.
 \item At least one of the \verb|JAVA_HOME|,
-  \verb|JAVA8_HOME|, \verb|JAVA11_HOME|, or \verb|JAVA17_HOME|
+  \verb|JAVA8_HOME|, \verb|JAVA11_HOME|, \verb|JAVA17_HOME|, or \verb|JAVA18_HOME|
   environment variables must be set.
 \item If set, the \verb|JAVA_HOME| environment variable must point to a
-  Java 8, 11, or 18 JDK.
+  Java 8, 11, 17, or 18 JDK.
 \item If set, the \verb|JAVA8_HOME| environment variable must point to a Java 8 JDK.
 \item If set, the \verb|JAVA11_HOME| environment variable must point to a Java 11 JDK.
 \item If set, the \verb|JAVA17_HOME| environment variable must point to a Java 17 JDK.

docs/manual/introduction.tex

@@ -824,7 +824,7 @@
 
 
 Here are some standard javac command-line options that you may find useful.
-Many of them contain the word ``processor'', because in javac jargon, a
+Many of them contain ``processor'' or ``proc'', because in javac jargon, a
 checker is an ``annotation processor''.
 
 \begin{itemize}
@@ -854,10 +854,6 @@
   the compiler or a checker.
 \end{itemize}
 
-The Checker Framework does not support \<-source 1.7> or earlier.  You must
-supply \<-source 1.8> or later, or no \<-source> command-line argument,
-when running \<javac>.
-
 
 \subsectionAndLabel{Checker auto-discovery}{checker-auto-discovery}
 

docs/manual/troubleshooting.tex

@@ -711,7 +711,7 @@
 \item[Ubuntu]
   Run the following commands, which should be the same as those in
   \<checker/bin-devel/Dockerfile-ubuntu-jdk\emph{XX}-plus>, where \emph{XX}
-  is a JDK version such as 8, 11, 17, 18, etc.:
+  is a JDK version such as 8, 11, 17, etc.:
 
 (This list should be the same as in
 \<checker/bin-devel/Dockerfile-ubuntu-jdk17-plus>; if your build fails

framework/src/main/java/org/checkerframework/framework/source/SourceChecker.java

@@ -550,8 +550,8 @@ public final synchronized void init(ProcessingEnvironment env) {
     if (jreVersion != 8 && jreVersion != 11 && jreVersion != 17 && jreVersion != 18) {
       message(
           (hasOption("permitUnsupportedJdkVersion") ? Kind.NOTE : Kind.WARNING),
-          "The Checker Framework is tested with JDK 8, 11, 17, and 18.  You are using version"
-              + " %d.",
+          "The Checker Framework is tested with JDK 8, 11, 17, and 18."
+              + " You are using version %d.",
           jreVersion);
     }
 

framework/src/main/java/org/checkerframework/framework/util/JavaParserUtil.java

@@ -358,7 +358,8 @@ public static ParserConfiguration.LanguageLevel getCurrentSourceVersion(
         case "RELEASE_17":
           currentSourceVersion = ParserConfiguration.LanguageLevel.JAVA_17;
           break;
-          // JavaParser does not yet have a constant for JDK 18.  The default is JAVA_17.
+          // As of 2022-09-27, JavaParser's ParserConfiguration.LanguageLevel does not yet have a
+          // constant for JDK 18.
           // case "RELEASE_18":
           //   currentSourceVersion = ParserConfiguration.LanguageLevel.JAVA_18;
           //   break;

framework/tests/all-systems/LubRawTypes.java

@@ -1,4 +1,4 @@
-// @above-java17-jdk-skip-test TODO: reinstate on JDK 18, false positives may be due to issue #979
+// @above-java17-jdk-skip-test TODO: reinstate, false positives may be due to issue #979
 
 @SuppressWarnings("unchecked")
 public class LubRawTypes {

framework/tests/all-systems/java8inference/Issue1397.java

@@ -1,7 +1,7 @@
 // Test case for Issue 1397.
 // https://github.com/typetools/checker-framework/issues/1397
 
-// @above-java17-jdk-skip-test TODO: reinstate on JDK 18, false positives may be due to issue #979
+// @above-java17-jdk-skip-test TODO: reinstate, false positives may be due to issue #979
 
 public class Issue1397 {
 

framework/tests/all-systems/java8inference/Issue1407.java

@@ -1,7 +1,7 @@
 // Test case for Issue 1407.
 // https://github.com/typetools/checker-framework/issues/1407
 
-// @above-java17-jdk-skip-test TODO: reinstate on JDK 18, false positives may be due to issue #979
+// @above-java17-jdk-skip-test TODO: reinstate, false positives may be due to issue #979
 
 abstract class Issue1407 {
   abstract <T> T foo(T p1, T p2);