feat(pacmak/java): isolate maven repositories (#1709)

When preparing a Java package using Maven, `jsii-pacmak` now configures
a dedicated `localRepository` for its own use. This prevents artifacts
cached from previous builds as well as local build artifacts to possibly
interfere with the compilation process.

This has the side-effect to force a re-download of all dependencies on
each build (except those that are generated as part of the same build),
which results in a performance degradation. It should be possible to
make the local repository location user-configurable so this impact can
be mitigated on a case-by-case basis.



---

By submitting this pull request, I confirm that my contribution is made under the terms of the [Apache 2.0 license].

[Apache 2.0 license]: https://www.apache.org/licenses/LICENSE-2.0

packages/@jsii/java-runtime/.gitignore

@@ -1,3 +1,4 @@
+.m2
 .vscode
 *.js
 *.d.ts

packages/@jsii/java-runtime/generate.sh

@@ -6,6 +6,7 @@ mkdir -p conf
 
 # generate pom.xml and JsiiVersion.java with version from package.json
 /usr/bin/env node ./pom.xml.t.js > ${project}/pom.xml
+/usr/bin/env node ./user.xml.t.js > ${project}/user.xml
 /usr/bin/env node JsiiVersion.t.js > ${project}/src/main/java/software/amazon/jsii/JsiiVersion.java
 
 # embed @jsii/runtime as a resource

packages/@jsii/java-runtime/package.json

@@ -25,8 +25,8 @@
   "types": "lib/index.d.ts",
   "scripts": {
     "gen": "/bin/bash ./generate.sh",
-    "build": "tsc --build && npm run gen && cd project && mvn -B deploy -D altDeploymentRepository=local::default::file://${PWD}/../maven-repo",
-    "dist-clean": "rm -rf dist maven-repo && cd project && mvn -B clean",
+    "build": "tsc --build && npm run gen && cd project && mvn -B deploy -D altDeploymentRepository=local::default::file://${PWD}/../maven-repo --settings=user.xml",
+    "dist-clean": "rm -rf dist maven-repo && cd project && mvn -B clean --settings=user.xml",
     "test": "echo 'Tests are run as part of the build target'",
     "test:update": "UPDATE_DIFF=1 npm run test",
     "package": "package-java && package-private"

packages/@jsii/java-runtime/project/.gitignore

@@ -3,6 +3,7 @@ bin/
 !index.js
 .idea
 pom.xml
+user.xml
 
 # generated by JsiiVersion.java.t.js
 src/main/java/software/amazon/jsii/JsiiVersion.java

packages/@jsii/java-runtime/user.xml.t.js

@@ -0,0 +1,13 @@
+const jsiiJavaRuntime = require('@jsii/java-runtime');
+const path = require('path');
+
+process.stdout.write(`<?xml version="1.0" encoding="UTF-8"?>
+<settings xmlns="http://maven.apache.org/POM/4.0.0"
+          xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+          xsi:schemaLocation="http://maven.apache.org/SETTINGS/1.0.0 https://maven.apache.org/xsd/settings-1.0.0.xsd">
+
+    <!-- Generated by ${__filename} at ${new Date().toISOString()} -->
+
+    <localRepository>${path.resolve(__dirname, 'project', '.m2', 'repository')}</localRepository>
+</settings>
+`);

packages/jsii-pacmak/lib/targets/java.ts

@@ -290,12 +290,17 @@ export class JavaBuilder implements TargetBuilder {
             '#comment': [
               `Generated by jsii-pacmak@${VERSION_DESC} on ${new Date().toISOString()}`,
             ],
+            // Do *not* attempt to ask the user for stuff...
+            interactiveMode: false,
+            // Use a non-default local repository to isolate from cached artifacts...
+            localRepository: path.resolve(where, '.m2', 'repository'),
+            // Register locations of locally-sourced dependencies
             profiles: {
               profile: {
                 id: profileName,
                 repositories: {
-                  repository: localRepos.map((repo, index) => ({
-                    id: `local${index}`,
+                  repository: localRepos.map((repo) => ({
+                    id: repo,
                     url: `file://${repo}`,
                   })),
                 },