add some jdbc-postgresql stuff from a pr

dev-java/caffeine/Manifest

@@ -0,0 +1 @@
+DIST caffeine-2.6.2-sources.jar 715580 BLAKE2B 882cac33d205c8186232c64010b4e25e805d3d188d6a9e6ca151187b55d5ee3a3d5641566f5e8d32de596fab3dae8967c74f3d60e2321b34374ce996382322fe SHA512 52a8c67648e2a6bb1c600d99712473a64911f2b6c8fe6c924ba98e72b4b040a1094fa5c93ae2bae8734d352634bc72960711afd152566ef02f6bad4c84e510c8

dev-java/caffeine/caffeine-2.6.2.ebuild

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+# Copyright 2023 Gentoo Authors
+# Distributed under the terms of the GNU General Public License v2
+
+EAPI=8
+
+JAVA_PKG_IUSE="doc source test"
+MAVEN_ID="com.github.ben-manes.caffeine:caffeine:${PV}"
+JAVA_TESTING_FRAMEWORKS="junit-4"
+
+inherit java-pkg-2 java-pkg-simple
+
+DESCRIPTION="A high performance caching library"
+HOMEPAGE="https://github.com/ben-manes/caffeine"
+SRC_URI="https://repo1.maven.org/maven2/com/github/ben-manes/caffeine/caffeine/${PV}/caffeine-${PV}-sources.jar"
+# Compiling from Github would require to be packaged at least
+# package com.squareup.javapoet
+# package MethodSpec
+# package TypeSpec
+# SRC_URI="https://github.com/ben-manes/caffeine/archive/v${PV}.tar.gz -> ${P}.tar.gz"
+# S="${WORKDIR}/${P}/caffeine"
+
+LICENSE="Apache-2.0"
+SLOT="0"
+KEYWORDS="~amd64"
+
+BDEPEND="app-arch/unzip"
+CP_DEPEND="dev-java/jsr305:0"
+DEPEND="${CP_DEPEND}
+	>=virtual/jdk-1.8:*"
+RDEPEND="${CP_DEPEND}
+	>=virtual/jre-1.8:*"
+
+JAVA_AUTOMATIC_MODULE_NAME="com.github.benmanes.caffeine"

dev-java/caffeine/metadata.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE pkgmetadata SYSTEM "https://www.gentoo.org/dtd/metadata.dtd">
+<pkgmetadata>
+	<maintainer type="project">
+		<email>java@gentoo.org</email>
+	</maintainer>
+	<upstream>
+		<remote-id type="github">ben-manes/caffeine</remote-id>
+	</upstream>
+</pkgmetadata>