Support import into Eclipse 2022-06

Fix a few issues preventing clean project import into Eclipse 2022-06:

  - `buildSrc` need to limit module imports to prevent clashes
    with those in the gradle API jar.

  - The CLI app needs some classpath changes in order to allow
    compileOnly project dependencies to resolve.

  - `AbstractJpaAutoConfigurationTests` needs some minor refactoring
    in order for generic captures to work with the Eclipse compiler.

buildSrc/build.gradle

@@ -2,6 +2,7 @@ plugins {
 	id "java-gradle-plugin"
 	id "io.spring.javaformat" version "${javaFormatVersion}"
 	id "checkstyle"
+	id "eclipse"
 }
 
 repositories {
@@ -110,3 +111,10 @@ gradlePlugin {
 test {
 	useJUnitPlatform()
 }
+
+eclipse.classpath.file.whenMerged {
+	def jreEntry = entries.find { it.path.contains("org.eclipse.jdt.launching.JRE_CONTAINER") }
+	jreEntry.entryAttributes['module'] = 'true'
+	jreEntry.entryAttributes['limit-modules'] = 'java.base'
+}
+