diff --git a/.github/workflows/gradle.yml b/.github/workflows/gradle.yml
index b820c93..6069fcf 100644
--- a/.github/workflows/gradle.yml
+++ b/.github/workflows/gradle.yml
@@ -9,10 +9,13 @@ jobs:
 
     strategy:
       matrix:
-        java: [ '11', '17', '21' ]
+        java: [ '8', '11', '17', '21' ]
 
     steps:
     - uses: actions/checkout@v4
+      with:
+        fetch-depth: 1
+        show-progress: false
     - name: Set up JDK
       uses: actions/setup-java@v4
       with:
@@ -27,4 +30,5 @@ jobs:
     - name: ./gradlew requireJavadoc
       run: ./gradlew requireJavadoc
     - name: ./gradlew spotlessCheck
+      if: ${{ matrix.java != '8' }}
       run: ./gradlew spotlessCheck
diff --git a/.gitignore b/.gitignore
index 10f5124..25b327a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -3,13 +3,22 @@ build
 
 *.class
 
+# BlueJ files
+*.ctxt
+
 # Mobile Tools for Java (J2ME)
 .mtj.tmp/
 
 # Package Files #
-# *.jar # Used by gradle
+*.jar # Need to commit gradle-wrapper.jar file
 *.war
 *.ear
+# .jar file not to ignore
+!gradle/wrapper/gradle-wrapper.jar
 
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*
+
+# IDE files
+.idea
+.vscode
diff --git a/.setup-CF.sh b/.setup-CF.sh
index 74aea4e..a9b3ae4 100755
--- a/.setup-CF.sh
+++ b/.setup-CF.sh
@@ -9,12 +9,12 @@ export SHELLOPTS
 
 export JAVA_HOME=${JAVA_HOME:-$(dirname $(dirname $(readlink -f $(which javac))))}
 
-git -C /tmp clone --depth 1 -q https://github.com/plume-lib/plume-scripts.git
+git -C /tmp clone --depth 1 -q https://github.com/eisop-plume-lib/git-scripts.git
 
 export CHECKERFRAMEWORK="${CHECKERFRAMEWORK:-$(pwd -P)/../checker-framework}"
 
 ## Build Checker Framework
-/tmp/plume-scripts/git-clone-related eisop checker-framework ${CHECKERFRAMEWORK}
+/tmp/git-scripts/git-clone-related eisop checker-framework ${CHECKERFRAMEWORK}
 
 (cd $CHECKERFRAMEWORK && ./gradlew assembleForJavac)
 
diff --git a/README.md b/README.md
index 99079e8..0d11f4b 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ See the [documentation](http://plumelib.org/multi-version-control/api/org/plumel
 
 ```
 cd SOME_DIRECTORY
-git clone https://github.com/plume-lib/multi-version-control
+git clone https://github.com/eisop-plume-lib/multi-version-control
 cd multi-version-control
 ./gradlew assemble
 ```
@@ -23,4 +23,4 @@ alias mvc='java -ea -cp SOME_DIRECTORY/multi-version-control/build/libs/multi-ve
 
 ## Other scripts for managing multiple git clones and branches
 
-See the scripts in [manage-git-branches](https://github.com/plume-lib/manage-git-branches).
+See the scripts in [manage-git-branches](https://github.com/eisop-plume-lib/manage-git-branches).
diff --git a/build.gradle b/build.gradle
index 3b6dba1..324a32b 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,3 +1,14 @@
+buildscript {
+  dependencies {
+    if (JavaVersion.current() >= JavaVersion.VERSION_11) {
+      // Code formatting; defines targets "spotlessApply" and "spotlessCheck".
+      // https://github.com/diffplug/spotless/tags ; see tags starting "gradle/"
+      // Only works on JDK 11+.
+      classpath 'com.diffplug.spotless:spotless-plugin-gradle:6.25.0'
+    }
+  }
+}
+
 plugins {
   id 'java'
   id 'application'
@@ -5,15 +16,14 @@ plugins {
   // To create a fat jar build/libs/...-all.jar, run: ./gradlew shadowJar
   id 'com.github.johnrengelman.shadow' version '8.1.1'
 
-  // Code formatting; defines targets "spotlessApply" and "spotlessCheck"
-  // Requires JDK 11 or higher; the plugin crashes under JDK 8.
-  id 'com.diffplug.spotless' version '6.25.0'
-
   // Error Prone linter
-  id('net.ltgt.errorprone') version '3.1.0'
+  id('net.ltgt.errorprone') version '4.0.1'
 
   // Checker Framework pluggable type-checking
-  id 'org.checkerframework' version '0.6.38'
+  id 'org.checkerframework' version '0.6.40'
+
+  // To show task list as a tree, run: ./gradlew <taskname> taskTree
+  id 'com.dorongold.task-tree' version '4.0.0'
 }
 
 repositories {
@@ -21,77 +31,108 @@ repositories {
   maven { url 'https://oss.sonatype.org/content/repositories/snapshots/' }
 }
 
+ext.errorproneVersion = '2.28.0'
+
 ext {
+  isJava11orHigher = JavaVersion.current() >= JavaVersion.VERSION_11
   isJava21orHigher = JavaVersion.current() >= JavaVersion.VERSION_21
 }
 
 dependencies {
-  implementation 'org.apache.commons:commons-exec:1.3'
+  implementation 'org.apache.commons:commons-exec:1.4.0'
   implementation 'org.ini4j:ini4j:0.5.4'
   implementation 'org.plumelib:options:2.0.3'
-  implementation 'org.plumelib:plume-util:1.9.0'
+  implementation 'org.plumelib:plume-util:1.9.3'
   implementation 'org.tmatesoft.svnkit:svnkit:1.10.11'
+
+  compileOnly "com.google.errorprone:error_prone_annotations:${errorproneVersion}"
+  errorprone("com.google.errorprone:error_prone_core:${errorproneVersion}")
 }
 
 application {
   mainClass = 'org.plumelib.multiversioncontrol.MultiVersionControl'
 }
 
-sourceCompatibility = 11
-targetCompatibility = 11
+java {
+  sourceCompatibility = JavaVersion.VERSION_1_8
+  targetCompatibility = JavaVersion.VERSION_1_8
+}
 
 
-spotless {
-  format 'misc', {
-    // define the files to apply `misc` to
-    target '*.md', '.gitignore'
+if (isJava11orHigher) {
+  apply plugin: 'com.diffplug.spotless'
+  spotless {
+    format 'misc', {
+      // define the files to apply `misc` to
+      target '*.md', '.gitignore'
 
-    // define the steps to apply to those files
-    trimTrailingWhitespace()
-    indentWithSpaces(2)
-    endWithNewline()
-  }
-  java {
-    targetExclude('**/WeakIdentityHashMap.java')
-    googleJavaFormat()
-    formatAnnotations()
-  }
-  groovyGradle {
-    target '**/*.gradle'
-    greclipse()  // which formatter Spotless should use to format .gradle files.
-    indentWithSpaces(2)
-    trimTrailingWhitespace()
-    // endWithNewline() // Don't want to end empty files with a newline
+      // define the steps to apply to those files
+      trimTrailingWhitespace()
+      indentWithSpaces(2)
+      endWithNewline()
+    }
+    java {
+      targetExclude('**/WeakIdentityHashMap.java')
+      googleJavaFormat()
+      formatAnnotations()
+    }
+    groovyGradle {
+      target '**/*.gradle'
+      greclipse()  // which formatter Spotless should use to format .gradle files.
+      indentWithSpaces(2)
+      trimTrailingWhitespace()
+      // endWithNewline() // Don't want to end empty files with a newline
+    }
   }
 }
 
 /// Error Prone linter
 
-dependencies {
-  errorprone('com.google.errorprone:error_prone_core:2.26.1')
-}
 tasks.withType(JavaCompile).configureEach {
   // "-processing" avoids javac warning "No processor claimed any of these annotations".
-  // "-options" is because starting in JDK 20, javac warns about using -source 8.
+  // "-Xlint:-options" is because of JDK 21 warning "source value 8 is obsolete..."
   options.compilerArgs << '-Xlint:all,-processing,-options' << '-Werror'
   if (isJava21orHigher) {
     options.compilerArgs << '-Xlint:-this-escape,-options'
   }
+  options.errorprone.enabled = isJava11orHigher
   options.errorprone {
+    disable('ExtendsObject')  // Incorrect when using the Checker Framework
     disable('ReferenceEquality') // Use Interning Checker instead.
   }
   options.forkOptions.jvmArgs += '-Xmx2g'
-  options.release = 11
 }
 
 /// Checker Framework pluggable type-checking
 
 apply plugin: 'org.checkerframework'
 
+if (true) {
+  // Use the released version of the EISOP Checker Framework.
+  ext.checkerFrameworkVersion = '3.42.0-eisop3'
+} else {
+  // To use a snapshot version of the EISOP Checker Framework.
+  // TODO: Change the above test to false to use a snapshot.
+  ext.checkerFrameworkVersion = '3.42.0-eisop4-SNAPSHOT'
+  configurations.all {
+    resolutionStrategy.cacheChangingModulesFor 0, 'minutes'
+  }
+}
+
 dependencies {
-  compileOnly 'io.github.eisop:checker-qual:3.34.0-eisop1'
-  testCompileOnly 'io.github.eisop:checker-qual:3.34.0-eisop1'
-  checkerFramework 'io.github.eisop:checker:3.34.0-eisop1'
+  compileOnly "io.github.eisop:checker-qual:${checkerFrameworkVersion}"
+  testCompileOnly "io.github.eisop:checker-qual:${checkerFrameworkVersion}"
+  checkerFramework "io.github.eisop:checker:${checkerFrameworkVersion}"
+}
+
+// To use a locally-built Checker Framework, run gradle with "-PcfLocal".
+if (project.hasProperty('cfLocal')) {
+  def cfHome = String.valueOf(System.getenv('CHECKERFRAMEWORK'))
+  dependencies {
+    compileOnly files(cfHome + '/checker/dist/checker-qual.jar')
+    testCompileOnly files(cfHome + '/checker/dist/checker-qual.jar')
+    checkerFramework files(cfHome + '/checker/dist/checker.jar')
+  }
 }
 
 checkerFramework {
@@ -110,46 +151,26 @@ checkerFramework {
     'org.checkerframework.common.initializedfields.InitializedFieldsChecker',
   ]
   extraJavacArgs = [
-    '-Werror',
-    // '-Aversion',
-    // '-verbose',
+    // No "'-Werror'" because of JDK 21 warning "source value 8 is obsolete..."
+    // '-Werror',
     '-AcheckPurityAnnotations',
     '-ArequirePrefixInWarningSuppressions',
     '-AwarnRedundantAnnotations',
     '-AwarnUnneededSuppressions',
     '-AnoJreVersionCheck',
+    '-Aversion',
   ]
 }
-// To use a snapshot version of the Checker Framework.
-if (false) {
-  // TODO: change the above test to false when CF is released
-  ext.checkerFrameworkVersion = '3.42.0-eisop3'
-  dependencies {
-    compileOnly "io.github.eisop:checker-qual:${checkerFrameworkVersion}"
-    testCompileOnly "io.github.eisop:checker-qual:${checkerFrameworkVersion}"
-    checkerFramework "io.github.eisop:checker:${checkerFrameworkVersion}"
-  }
-  configurations.all {
-    resolutionStrategy.cacheChangingModulesFor 0, 'minutes'
-  }
-}
-// To use a locally-built Checker Framework, run gradle with "-PcfLocal".
-if (project.hasProperty('cfLocal')) {
-  def cfHome = String.valueOf(System.getenv('CHECKERFRAMEWORK'))
-  dependencies {
-    compileOnly files(cfHome + '/checker/dist/checker-qual.jar')
-    testCompileOnly files(cfHome + '/checker/dist/checker-qual.jar')
-    checkerFramework files(cfHome + '/checker/dist/checker.jar')
-  }
-}
 
 /// Javadoc
 
 // Turn Javadoc warnings into errors.
 javadoc {
-  options.addStringOption('Xwerror', '-Xdoclint:all')
+  // No "'-Werror'" because of JDK 21 warning "source value 8 is obsolete..."
+  // options.addStringOption('Xwerror', '-Xdoclint:all')
+  options.addStringOption('Xdoclint:all', '-quiet')
   options.addStringOption('private', '-quiet')
-  options.addStringOption('source', '11')
+  options.addStringOption('source', '8')
   doLast {
     ant.replaceregexp(match:"@import url\\('resources/fonts/dejavu.css'\\);\\s*", replace:'',
     flags:'g', byline:true) {
@@ -164,12 +185,19 @@ task javadocWeb(type: Javadoc) {
   source = sourceSets.main.allJava
   destinationDir = file("/cse/web/research/plumelib/${project.name}/api")
   classpath = project.sourceSets.main.compileClasspath
-  options.addStringOption('source', '11')
+  options.addStringOption('source', '8')
   doLast {
     ant.replaceregexp(match:"@import url\\('resources/fonts/dejavu.css'\\);\\s*", replace:'',
     flags:'g', byline:true) {
       fileset(dir: destinationDir)
     }
+    // Set permissions
+    project.exec {
+      commandLine('chgrp', '-R',  'plse_www', "/cse/web/research/plumelib/${project.name}/api")
+    }
+    project.exec {
+      commandLine('chmod', '-R',  'g+w', "/cse/web/research/plumelib/${project.name}/api")
+    }
   }
 }
 
@@ -180,6 +208,7 @@ dependencies {
   requireJavadoc 'org.plumelib:require-javadoc:1.0.9'
 }
 task requireJavadoc(type: JavaExec) {
+  group = 'Documentation'
   description = 'Ensures that Javadoc documentation exists.'
   mainClass = 'org.plumelib.javadoc.RequireJavadoc'
   classpath = configurations.requireJavadoc
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index a80b22c..a441313 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.6-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.8-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
diff --git a/gradlew b/gradlew
index 1aa94a4..b740cf1 100755
--- a/gradlew
+++ b/gradlew
@@ -55,7 +55,7 @@
 #       Darwin, MinGW, and NonStop.
 #
 #   (3) This script is generated from the Groovy template
-#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       https://github.com/gradle/gradle/blob/HEAD/platforms/jvm/plugins-application/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
 #       within the Gradle project.
 #
 #       You can find Gradle at https://github.com/gradle/gradle/.
diff --git a/settings.gradle b/settings.gradle
index ac3c0c8..fb2a72f 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -1,8 +1,8 @@
-buildscript {
-  if (JavaVersion.current() == JavaVersion.VERSION_1_8) {
-    throw new Error("Use Java 11 or later.")
-  }
-}
+// buildscript {
+//   if (JavaVersion.current() == JavaVersion.VERSION_1_8) {
+//     throw new Error("Use Java 11 or later.")
+//   }
+// }
 
 // Project name is read-only in build scripts, and defaults to directory name.
 rootProject.name = 'multi-version-control'
diff --git a/src/main/java/org/plumelib/multiversioncontrol/MultiVersionControl.java b/src/main/java/org/plumelib/multiversioncontrol/MultiVersionControl.java
index 2c7cf7d..8baf95e 100644
--- a/src/main/java/org/plumelib/multiversioncontrol/MultiVersionControl.java
+++ b/src/main/java/org/plumelib/multiversioncontrol/MultiVersionControl.java
@@ -9,7 +9,9 @@
 import java.io.IOException;
 import java.io.InputStream;
 import java.io.UncheckedIOException;
+import java.io.UnsupportedEncodingException;
 import java.nio.file.Files;
+import java.time.Duration;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Comparator;
@@ -1105,7 +1107,8 @@ static void addCheckoutCvs(File cvsDir, File parentDir, Set<Checkout> checkouts)
       // apparently it wasn't a version control directory
       return;
     }
-    String pathInRepo = FilesPlume.readFile(repositoryFile).trim();
+
+    String pathInRepo = FilesPlume.readString(repositoryFile.toPath()).trim();
     @NonNull File repoFileRoot = new File(pathInRepo);
     while (repoFileRoot.getParentFile() != null) {
       repoFileRoot = repoFileRoot.getParentFile();
@@ -1126,7 +1129,7 @@ static void addCheckoutCvs(File cvsDir, File parentDir, Set<Checkout> checkouts)
       pathInRepoAtCheckout = dirRelative.getName();
     }
 
-    String repoRoot = FilesPlume.readFile(rootFile).trim();
+    String repoRoot = FilesPlume.readString(rootFile.toPath()).trim();
     checkouts.add(new Checkout(RepoType.CVS, dirRelative, repoRoot, pathInRepoAtCheckout));
   }
 
@@ -1529,7 +1532,17 @@ public void process(Set<Checkout> checkouts) {
             case GIT:
               // "--" is to prevent the directory name from being interpreted as a command-line
               // option, if it starts with a hyphen.
-              pb.command(gitExecutable, "clone", "--", c.repository, dirbase);
+              // "--filter=blob:none" makes cloning fast and reduces disk space.  It makes a
+              // subsequent `git blame` command slower, since it has retrieve information from the
+              // remote repository.  It makes pulling from the cloned repository impossible.
+              pb.command(
+                  gitExecutable,
+                  "clone",
+                  "--recursive",
+                  // "--filter=blob:none",
+                  "--",
+                  c.repository,
+                  dirbase);
               addArgs(pb, gitArg);
               break;
             case HG:
@@ -1963,12 +1976,13 @@ int perform_command(ProcessBuilder pb, List<Replacer> replacers, boolean showNor
     String[] argArray = Arrays.copyOfRange(args, 1, args.length);
     cmdLine.addArguments(argArray);
     DefaultExecuteResultHandler resultHandler = new DefaultExecuteResultHandler();
-    DefaultExecutor executor = new DefaultExecutor();
     @SuppressWarnings("nullness") // defaults to non-null and was never reset
     @NonNull File defaultDirectory = pb.directory();
-    executor.setWorkingDirectory(defaultDirectory);
+    DefaultExecutor executor =
+        DefaultExecutor.builder().setWorkingDirectory(defaultDirectory).get();
 
-    ExecuteWatchdog watchdog = new ExecuteWatchdog(timeout * 1000L);
+    ExecuteWatchdog watchdog =
+        ExecuteWatchdog.builder().setTimeout(Duration.ofSeconds(timeout)).get();
     executor.setWatchdog(watchdog);
 
     final ByteArrayOutputStream outStream = new ByteArrayOutputStream();
@@ -2013,9 +2027,9 @@ int perform_command(ProcessBuilder pb, List<Replacer> replacers, boolean showNor
       // Filter then print the output.
       String output;
       try {
-        String tmpOutput = outStream.toString(UTF_8);
+        String tmpOutput = outStream.toString(UTF_8.toString());
         output = tmpOutput;
-      } catch (RuntimeException e) {
+      } catch (RuntimeException | UnsupportedEncodingException e) {
         throw new Error("Exception getting process standard output");
       }