Make e2e sample apps build/run on JDK 25

The e2e matrix rows for Java 25 failed because each sample app's own Gradle
8.14 wrapper cannot run on JDK 25. Bump the sample-app wrappers to Gradle
9.6.1 and, where the language compiler itself needs JDK 25 support:
- JavalinPostgres: migrate shadow plugin to com.gradleup.shadow 9.5.1
- SpringMVCPostgresKotlin / JavalinMySQLKotlin: Kotlin -> 2.2.20
- SpringMVCPostgresGroovy: Groovy -> 4.0.28

Exclude SpringBoot2.7Postgres from the Java 25 row: Spring Boot 2.7 (legacy
javax stack) does not support JDK 25; its javax coverage stays on 17-24.

Verified locally on JDK 25: SpringBootPostgres, SpringBootMySQL and
SpringBootHyperSQL block a SQL injection end-to-end. Apps that don't block in
the local setup behave identically on JDK 21 (local DB/env, not a Java 25
regression); CI provisions the databases and validates the full matrix.

Author: dmitrii

.github/workflows/end2end.yml

@@ -51,6 +51,11 @@ jobs:
           - { name: SpringBootHyperSQL, test_file: end2end/spring_boot_hypersql.py, db: "" }
         java-version: [17, 18, 19, 20, 21, 24, 25]
         distribution: ['adopt', 'corretto', 'oracle']
+        exclude:
+          # Spring Boot 2.7 uses the legacy javax stack and does not support JDK 25;
+          # keep this app on Java 17-24 only (its javax coverage stays exercised there).
+          - app: { name: SpringBoot2.7Postgres, test_file: end2end/spring_boot_2.7_postgres.py, db: postgres_database }
+            java-version: 25
     steps:
       - name: Download build artifacts
         uses: actions/download-artifact@v4

sample-apps/JavalinMySQLKotlin/pom.xml

@@ -11,7 +11,7 @@
     <properties>
         <maven.compiler.source>17</maven.compiler.source>
         <maven.compiler.target>17</maven.compiler.target>
-        <kotlin.version>1.8.0</kotlin.version> <!-- Change to a stable version -->
+        <kotlin.version>2.2.20</kotlin.version> <!-- 2.2.x required for JDK 25 -->
         <log4j2-version>2.24.3</log4j2-version>
     </properties>
 

sample-apps/JavalinPostgres/build.gradle

@@ -1,6 +1,6 @@
 plugins {
     id 'java'
-    id 'com.github.johnrengelman.shadow' version '7.1.2'
+    id 'com.gradleup.shadow' version '9.5.1'
 }
 
 group = 'dev.aikido'

sample-apps/JavalinPostgres/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 #Tue Dec 17 13:31:53 CET 2024
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.14-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.6.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

sample-apps/SpringBootHyperSQL/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.14-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.6.1-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

sample-apps/SpringBootMSSQL/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.14-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.6.1-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

sample-apps/SpringBootMySQL/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.14-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.6.1-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

sample-apps/SpringBootPostgres/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.14-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.6.1-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME

sample-apps/SpringMVCPostgresGroovy/build.gradle

@@ -8,6 +8,10 @@ plugins {
 group = 'com.example'
 version = '0.0.1-SNAPSHOT'
 
+// Spring Boot 3.4.1 manages an older Groovy 4.0.x whose ASM can't run on JDK 25;
+// Groovy 4.0.27+ adds Java 25 support.
+ext['groovy.version'] = '4.0.28'
+
 java {
 	sourceCompatibility = '17'
 	targetCompatibility = '17'

sample-apps/SpringMVCPostgresGroovy/gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.14-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-9.6.1-bin.zip
 networkTimeout=10000
 validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME