vlsi · Nov 8, 2026 · Nov 8, 2026 · Nov 8, 2026
diff --git a/.github/actions/build/action.yml b/.github/actions/build/action.yml
@@ -1,15 +1,31 @@
 name: Build plugin
 description: Builds the plugin
+inputs:
+  maven_args:
+    required: false
+    description: Extra Maven arguments, such as -Pmat-latest to build against the newest MAT
+    default: ''
+  test_jvm_args:
+    required: false
+    description: Extra JVM options for the tests, such as a locale or a time zone
+    default: ''
+  upload_update_site:
+    required: false
+    description: Whether to attach the update site to the workflow run
+    default: 'true'
 runs:
   using: "composite"
   steps:
     - name: Test
       shell: bash
+      env:
+        BUILD_MAVEN_ARGS: ${{ inputs.maven_args }}
+        TEST_JVM_ARGS: ${{ inputs.test_jvm_args }}
       run: |
-        ./mvnw --color=always -B verify
+        ./mvnw --color=always -B $BUILD_MAVEN_ARGS "-Dtest.jvm.args=$TEST_JVM_ARGS" verify
     - uses: actions/upload-artifact@v7
       name: Attach generated update site as zip
-      if: runner.os == 'Linux'
+      if: inputs.upload_update_site == 'true'
       with:
         name: mat-calcite-plugin-update-site
         # actions/upload-artifact always creates .zip, so we specify directory here to prevent double zip archiving

diff --git a/.github/actions/setup_java/action.yml b/.github/actions/setup_java/action.yml
@@ -5,13 +5,17 @@ inputs:
     required: true
     description: Java version for building the plugin
     default: '17'
+  java_distribution:
+    required: false
+    description: Java distribution, as actions/setup-java names it
+    default: zulu
 runs:
   using: "composite"
   steps:
     - name: 'Set up JDK ${{ inputs.java_version }}'
       uses: actions/setup-java@v6
       with:
-        distribution: zulu
+        distribution: ${{ inputs.java_distribution }}
         java-version: ${{ inputs.java_version }}
     - name: Cache local Maven repository
       uses: actions/cache@v6

diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
@@ -7,6 +7,12 @@ on:
   pull_request:
     branches:
       - '**'
+  # Replays the matrix of an earlier run: its seed is in the step summary of "Matrix Preparation"
+  workflow_dispatch:
+    inputs:
+      matrix_rng_seed:
+        description: RNG seed
+        required: false
 
 concurrency:
   # On main/release, we don't want any jobs cancelled so the sha is used to name the group
@@ -16,34 +22,57 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
+  matrix_prep:
+    name: Matrix Preparation
+    runs-on: ubuntu-latest
+    outputs:
+      matrix: ${{ steps.set-matrix.outputs.matrix }}
+    env:
+      MATRIX_JOBS: 4
+      # Every push to a pull request draws the same jobs
+      GITHUB_PR_NUMBER: ${{ github.event.number }}
+      RNG_SEED: ${{ github.event.inputs.matrix_rng_seed }}
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v7
+      - id: set-matrix
+        name: Generate the matrix
+        shell: bash
+        run: |
+          npm ci --prefix .github/workflows
+          node .github/workflows/matrix.mjs
+
   build-test:
+    needs: matrix_prep
     strategy:
-      matrix:
-        java: [ 17 ]
-        os: [ ubuntu-latest, windows-latest ]
-    name: 'Test, ${{ matrix.os }}, java ${{ matrix.java }}'
-    runs-on: ${{ matrix.os }}
+      fail-fast: false
+      matrix: ${{ fromJson(needs.matrix_prep.outputs.matrix) }}
+    name: ${{ matrix.name }}
+    runs-on: ${{ matrix.runs_on }}
     steps:
       - name: Checkout sources
         uses: actions/checkout@v7
       - name: Setup Java
         uses: ./.github/actions/setup_java
         with:
-          java_version: ${{ matrix.java }}
+          java_version: ${{ matrix.java_version }}
+          java_distribution: ${{ matrix.java_distribution }}
       - name: Build
         uses: ./.github/actions/build
         with:
-          java_version: ${{ matrix.java }}
+          maven_args: ${{ matrix.maven_args }}
+          test_jvm_args: ${{ matrix.test_jvm_args }}
+          upload_update_site: ${{ matrix.publish }}
       - name: Publish Eclipse update site
-        if: runner.os == 'Linux' && github.repository == 'vlsi/mat-calcite-plugin' && github.ref == 'refs/heads/main'
+        if: matrix.publish && github.repository == 'vlsi/mat-calcite-plugin' && github.ref == 'refs/heads/main'
         uses: ./.github/actions/publish-update-site
         with:
           update_site_token:
             ${{ secrets.UPDATE_SITE_TOKEN }}
 
   ci-gate:
     name: CI Gate
-    needs: [build-test]
+    needs: [matrix_prep, build-test]
     if: always()
     runs-on: ubuntu-latest
     steps:

diff --git a/.github/workflows/matrix.mjs b/.github/workflows/matrix.mjs
@@ -0,0 +1,100 @@
+// Generates a random subset of the MAT, Java, OS, locale and time zone combinations for CI.
+// Preview the jobs with "node .github/workflows/matrix.mjs" after "npm ci --prefix .github/workflows".
+// See https://github.com/vlsi/github-actions-random-matrix
+import { readFileSync } from 'fs';
+import { createGitHubMatrixBuilder, setGitHubOutput } from '@vlsi/github-actions-random-matrix/github';
+
+const { matrix } = createGitHubMatrixBuilder();
+matrix.failOnUnsatisfiableFilters(true);
+
+// The Java version each MAT needs is the execution environment the root pom sets for it: the default
+// for the oldest supported MAT, the mat-latest profile for the newest one.
+const pom = readFileSync(new URL('../../pom.xml', import.meta.url), 'utf8');
+const [oldestMatJava, newestMatJava] = [...pom.matchAll(/<mat\.executionEnvironment>JavaSE-(\d+)</g)]
+  .map(m => Number(m[1]));
+if (!oldestMatJava || !newestMatJava) {
+  throw new Error('pom.xml should set mat.executionEnvironment twice: by default and in the mat-latest profile');
+}
+
+matrix.addAxis({
+  name: 'mat',
+  title: x => x.title,
+  values: [
+    {value: 'oldest', title: 'oldest MAT', maven_args: '', min_java: oldestMatJava},
+    {value: 'newest', title: 'newest MAT', maven_args: '-Pmat-latest', min_java: newestMatJava},
+  ]
+});
+
+matrix.addAxis({
+  name: 'java_version',
+  title: x => 'Java ' + x,
+  // No supported MAT runs on a Java older than the oldest MAT requires
+  values: ['17', '21', '25'].filter(v => Number(v) >= oldestMatJava)
+});
+
+matrix.addAxis({
+  name: 'java_distribution',
+  values: ['corretto', 'liberica', 'microsoft', 'temurin', 'zulu']
+});
+
+matrix.addAxis({
+  name: 'os',
+  title: x => x.value.replace('-latest', ''),
+  values: [
+    {value: 'ubuntu-latest', weight: 4},
+    {value: 'windows-latest', weight: 1},
+  ]
+});
+
+// Turkish finds case conversions without an explicit locale, since "I" lowercases to a dotless "ı"
+matrix.addAxis({
+  name: 'locale',
+  title: x => x.language + '_' + x.country,
+  values: [
+    {language: 'en', country: 'US'},
+    {language: 'de', country: 'DE'},
+    {language: 'tr', country: 'TR'},
+  ]
+});
+
+// Pacific/Chatham has a UTC offset of +12:45, which no whole-hour arithmetic gets right
+matrix.addAxis({
+  name: 'tz',
+  values: ['UTC', 'America/New_York', 'Pacific/Chatham']
+});
+
+matrix.constrain(['mat', 'java_version'], (mat, javaVersion) => Number(javaVersion) >= mat.min_java);
+
+matrix.setNamePattern(['mat', 'java_version', 'java_distribution', 'os', 'locale', 'tz']);
+
+const include = matrix.generateRows(Number(process.env.MATRIX_JOBS || 4), {
+  require: [
+    // The update site is built from the oldest supported MAT, on the oldest Java it supports
+    {
+      filter: {mat: {value: 'oldest'}, java_version: String(oldestMatJava), os: {value: 'ubuntu-latest'}},
+      tag: row => { row.publish = true; },
+    },
+    ...matrix.allAxisValues('mat'),
+    ...matrix.allAxisValues('java_version'),
+    ...matrix.allAxisValues('os'),
+  ],
+});
+if (include.length === 0) {
+  throw new Error('Matrix list is empty');
+}
+
+include.sort((a, b) => a.name.localeCompare(b.name, undefined, {numeric: true}));
+include.forEach(row => {
+  row.runs_on = row.os.value;
+  row.maven_args = row.mat.maven_args;
+  row.test_jvm_args = `-Duser.language=${row.locale.language} -Duser.country=${row.locale.country} -Duser.timezone=${row.tz}`;
+  row.publish = row.publish === true;
+});
+
+if (process.argv.includes('--coverage')) {
+  const coverage = matrix.pairCoverageReport();
+  console.log(`Pair coverage: ${coverage.covered}/${coverage.total} (${coverage.percentage}%)`);
+} else {
+  console.log(include);
+  setGitHubOutput('matrix', {include});
+}
diff --git a/.github/workflows/package-lock.json b/.github/workflows/package-lock.json
diff --git a/.github/workflows/package.json b/.github/workflows/package.json
@@ -0,0 +1,7 @@
+{
+  "private": true,
+  "type": "module",
+  "dependencies": {
+    "@vlsi/github-actions-random-matrix": "2.4.0"
+  }
+}
diff --git a/.gitignore b/.gitignore
@@ -16,3 +16,4 @@ dependency-reduced-pom.xml
 
 # Windows image cache files
 Thumbs.db
+.github/workflows/node_modules/
diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -1,4 +1,6 @@
 ## [Unreleased]
+### Changed
+- Eclipse Memory Analyzer 1.15.0 or higher is required. The plugin supports the newest MAT release that is at least two years old, see "Supported versions" in README.md
 
 ## [1.6.2] - 2023-11-17
 ### Fixed

diff --git a/MatCalcitePlugin/META-INF/MANIFEST.MF b/MatCalcitePlugin/META-INF/MANIFEST.MF
@@ -5,8 +5,8 @@ Bundle-SymbolicName: MatCalcitePlugin;singleton:=true
 Bundle-Version: 1.6.4.qualifier
 Bundle-Vendor: Vladimir Sitnikov
 Bundle-RequiredExecutionEnvironment: JavaSE-17
-Require-Bundle: org.eclipse.mat.api;bundle-version="1.13.0",
- org.eclipse.mat.ui;bundle-version="1.13.0",
+Require-Bundle: org.eclipse.mat.api;bundle-version="1.15.0",
+ org.eclipse.mat.ui;bundle-version="1.15.0",
  org.eclipse.ui;bundle-version="3.6.0",
  org.eclipse.core.runtime;bundle-version="3.7.0",
  org.eclipse.jface.text;bundle-version="3.7.2",

diff --git a/MatCalciteTargetPlatform/MatCalciteTargetPlatform.target b/MatCalciteTargetPlatform/MatCalciteTargetPlatform.target
@@ -1,68 +1,29 @@
 <?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<?pde version="3.5"?>
-<target includeMode="feature" name="eclipse 4.5.0">
+<?pde version="3.8"?>
+<!--
+    The oldest MAT the plugin supports (see "Supported versions" in README.md), and the Eclipse release that MAT
+    builds against. The plugin compiles against this target, and the update site is built from it.
+    mat-latest.target lists the newest MAT for the tests.
+-->
+<target includeMode="feature" name="MAT Calcite: oldest supported MAT">
     <locations>
         <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="planner" includeSource="false" type="InstallableUnit">
-            <repository location="https://download.eclipse.org/releases/2022-12"/>
+            <repository location="https://download.eclipse.org/eclipse/updates/4.30/"/>
             <unit id="org.eclipse.equinox.executable.feature.group" version="0.0.0"/>
             <unit id="org.eclipse.equinox.p2.user.ui.feature.group" version="0.0.0"/>
             <unit id="org.eclipse.rcp.feature.group" version="0.0.0"/>
+            <!-- For MatCalciteTest -->
+            <unit id="org.junit" version="0.0.0"/>
         </location>
-        <location includeDependencyDepth="infinite" includeDependencyScopes="compile,provided,runtime" includeSource="true" label="Maven Central" missingManifest="generate" type="Maven">
-            <dependencies>
-                <dependency>
-                    <groupId>net.minidev</groupId>
-                    <artifactId>accessors-smart</artifactId>
-                    <version>2.6.0</version>
-                </dependency>
-                <dependency>
-                    <groupId>net.minidev</groupId>
-                    <artifactId>json-smart</artifactId>
-                    <version>2.6.0</version>
-                </dependency>
-                <dependency>
-                    <groupId>org.apache.calcite</groupId>
-                    <artifactId>calcite-core</artifactId>
-                    <version>1.36.0</version>
-                </dependency>
-                <!-- Calcite asks for an older Avatica; Avatica before 1.29.0 has CVE-2026-70410 -->
-                <dependency>
-                    <groupId>org.apache.calcite.avatica</groupId>
-                    <artifactId>avatica-core</artifactId>
-                    <version>1.29.0</version>
-                </dependency>
-                <dependency>
-                    <groupId>com.google.guava</groupId>
-                    <artifactId>guava</artifactId>
-                    <version>33.7.2-jre</version>
-                </dependency>
-                <dependency>
-                    <groupId>com.google.code.findbugs</groupId>
-                    <artifactId>jsr305</artifactId>
-                    <version>3.0.2</version>
-                </dependency>
-                <dependency>
-                    <groupId>org.codehaus.janino</groupId>
-                    <artifactId>commons-compiler</artifactId>
-                    <version>3.1.12</version>
-                </dependency>
-                <dependency>
-                    <groupId>org.codehaus.janino</groupId>
-                    <artifactId>janino</artifactId>
-                    <version>3.1.12</version>
-                </dependency>
-            </dependencies>
-            <instructions><![CDATA[
-        -reproducible: true
-        -noextraheaders: true
-        Bundle-Name:           Bundle derived from maven artifact ${mvnGroupId}:${mvnArtifactId}:${mvnVersion}
-        version:               ${version_cleanup;${mvnVersion}}
-        Bundle-SymbolicName:   wrapped.${mvnGroupId}.${mvnArtifactId}
-        Bundle-Version:        ${version}
-        Import-Package:        *;resolution:=optional
-        Export-Package:        *;version="${version}";-noimport:=true
-        DynamicImport-Package: *
-        ]]></instructions>
+        <!-- The MAT feature would bring BIRT and Rhino for the charts, which the plugin does not use -->
+        <location includeAllPlatforms="false" includeConfigurePhase="false" includeMode="planner" includeSource="false" type="InstallableUnit">
+            <repository location="https://download.eclipse.org/mat/1.15.0/update-site/"/>
+            <unit id="org.eclipse.mat.api" version="0.0.0"/>
+            <unit id="org.eclipse.mat.report" version="0.0.0"/>
+            <unit id="org.eclipse.mat.ui" version="0.0.0"/>
+            <unit id="org.eclipse.mat.parser" version="0.0.0"/>
+            <unit id="org.eclipse.mat.hprof" version="0.0.0"/>
         </location>
+        <location type="Target" uri="file:${project_loc:/MatCalciteTargetPlatform}/dependencies.target"/>
     </locations>
 </target>
Original file line number	Diff line number	Diff line change
Expand Up		@@ -16,3 +16,4 @@ dependency-reduced-pom.xml

		# Windows image cache files
		Thumbs.db
		.github/workflows/node_modules/