Enable library desugaring, upgrade H2.

bramble-core/build.gradle

@@ -14,8 +14,7 @@ dependencies {
 	api "org.briarproject:onionwrapper-core:$onionwrapper_version"
 
 	implementation "org.bouncycastle:bcprov-jdk15to18:$bouncy_castle_version"
-	//noinspection GradleDependency
-	implementation 'com.h2database:h2:1.4.192' // The last version that supports Java 1.6
+	implementation 'com.h2database:h2:1.4.200' // The last version that doesn't require NIO
 	implementation 'org.bitlet:weupnp:0.1.4'
 	implementation 'net.i2p.crypto:eddsa:0.2.0'
 	implementation 'org.whispersystems:curve25519-java:0.5.0'

bramble-core/src/main/java/org/briarproject/bramble/db/H2Database.java

@@ -57,8 +57,7 @@ class H2Database extends JdbcDatabase {
 		this.config = config;
 		File dir = config.getDatabaseDirectory();
 		String path = new File(dir, "db").getAbsolutePath();
-		url = "jdbc:h2:split:" + path + ";CIPHER=AES;MULTI_THREADED=1"
-				+ ";WRITE_DELAY=0";
+		url = "jdbc:h2:split:" + path + ";CIPHER=AES;WRITE_DELAY=0";
 	}
 
 	@Override

bramble-core/witness.gradle

@@ -18,7 +18,7 @@ dependencyVerification {
 		    'com.google.guava:guava:31.0.1-jre:guava-31.0.1-jre.jar:d5be94d65e87bd219fb3193ad1517baa55a3b88fc91d21cf735826ab5af087b9',
 		    'com.google.guava:listenablefuture:9999.0-empty-to-avoid-conflict-with-guava:listenablefuture-9999.0-empty-to-avoid-conflict-with-guava.jar:b372a037d4230aa57fbeffdef30fd6123f9c0c2db85d0aced00c91b974f33f99',
 		    'com.google.j2objc:j2objc-annotations:1.3:j2objc-annotations-1.3.jar:21af30c92267bd6122c0e0b4d20cccb6641a37eaf956c6540ec471d584e64a7b',
-        'com.h2database:h2:1.4.192:h2-1.4.192.jar:225b22e9857235c46c93861410b60b8c81c10dc8985f4faf188985ba5445126c',
+		    'com.h2database:h2:1.4.200:h2-1.4.200.jar:3ad9ac4b6aae9cd9d3ac1c447465e1ed06019b851b893dd6a8d76ddb6d85bca6',
 		    'com.squareup.okhttp3:mockwebserver:4.10.0:mockwebserver-4.10.0.jar:af29da234e63159d6e0dea43bf8288eea97d71cdf1651a5ee2d6c0d0d4adbf8f',
 		    'com.squareup.okhttp3:okhttp:4.10.0:okhttp-4.10.0.jar:7580f14fa1691206e37081ad3f92063b1603b328da0bb316f2fef02e0562e7ec',
 		    'com.squareup.okio:okio-jvm:3.0.0:okio-jvm-3.0.0.jar:be64a0cc1f28ea9cd5c970dd7e7557af72c808d738c495b397bf897c9921e907',

briar-android/build.gradle

@@ -78,6 +78,7 @@ android {
 	compileOptions {
 		sourceCompatibility JavaVersion.VERSION_1_8
 		targetCompatibility JavaVersion.VERSION_1_8
+		coreLibraryDesugaringEnabled true
 	}
 
 	testOptions {
@@ -143,6 +144,8 @@ dependencies {
 
 	compileOnly 'javax.annotation:jsr250-api:1.0'
 
+	coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.1.5'
+
 	testImplementation project(path: ':bramble-api', configuration: 'testOutput')
 	testImplementation project(path: ':bramble-core', configuration: 'testOutput')
 

briar-android/witness.gradle

@@ -87,6 +87,8 @@ dependencyVerification {
 		    'androidx.window:window:1.0.0:window-1.0.0.aar:3212985be4127373ca4d0ea7f8b81a250ae2105e924f7940105d067a0f9ac130',
 		    'cglib:cglib:3.2.8:cglib-3.2.8.jar:3f64de999ecc5595dc84ca8ff0879d8a34c8623f9ef3c517a53ed59023fcb9db',
 		    'com.almworks.sqlite4java:sqlite4java:1.0.392:sqlite4java-1.0.392.jar:243a64470fda0e86a6fddeb0af4c7aa9426ce84e68cbfe18d75ee5da4b7e0b92',
+		    'com.android.tools:desugar_jdk_libs:1.1.5:desugar_jdk_libs-1.1.5.jar:52b390b038c5fd62b1ec697bdf5e236ac3286756667350e5466838edea9cb26e',
+		    'com.android.tools:desugar_jdk_libs_configuration:1.1.5:desugar_jdk_libs_configuration-1.1.5.jar:4ed1e921fd0ffcfeef2f10ce248f7725b139f593d4bc3549bf694b2e4d3f73a5',
 		    'com.github.bumptech.glide:annotations:4.14.2:annotations-4.14.2.jar:8419bf262be70edeb6b9582b386546be66d2e8659c7aae65fd69a9ede02c4877',
 		    'com.github.bumptech.glide:compiler:4.14.2:compiler-4.14.2.jar:315b1325283c3d0cf9bc0599c1ecdb85e5f7863b1aa25991b63d616b13930cb6',
 		    'com.github.bumptech.glide:gifdecoder:4.14.2:gifdecoder-4.14.2.aar:d021eee1ac1a036fcdc377b6dc3b218f4a0cc2bc2f096d69b474198b635e8302',