diff --git a/bin/compile b/bin/compile
index 741caf9..3d0e263 100755
--- a/bin/compile
+++ b/bin/compile
@@ -1,21 +1,19 @@
 #!/usr/bin/env bash
-# bin/compile <build-dir> <cache-dir> <env-dir>
-
 set -e
 
-BP_DIR=$(
-	cd "$(dirname "${0}")/"..
+BUILD_DIR="${1}"
+CACHE_DIR="${2}"
+ENV_DIR="${3}"
+
+BUILDPACK_DIR=$(
+	cd "$(dirname "${0}")"/..
 	pwd
 )
 
-BUILD_DIR=$1
-CACHE_DIR=$2
-ENV_DIR=$3
-
-source "${BP_DIR}/lib/util.sh"
-source "${BP_DIR}/lib/common.sh"
-source "${BP_DIR}/lib/maven.sh"
-source "${BP_DIR}/lib/metadata.sh"
+source "${BUILDPACK_DIR}/lib/util.sh"
+source "${BUILDPACK_DIR}/lib/common.sh"
+source "${BUILDPACK_DIR}/lib/maven.sh"
+source "${BUILDPACK_DIR}/lib/metadata.sh"
 
 # Initialise the buildpack metadata store.
 # This is used to track state across builds (for cache invalidation and messaging when build
diff --git a/bin/release b/bin/release
index c1058d1..a1e1d96 100755
--- a/bin/release
+++ b/bin/release
@@ -1,19 +1,18 @@
 #!/usr/bin/env bash
-# bin/release <build-dir>
-
 set -e
 
-BP_DIR=$(
+BUILD_DIR="${1}"
+
+BUILDPACK_DIR=$(
 	cd "$(dirname "${0}")"/..
 	pwd
 )
-BUILD_DIR=$1
 
-source "${BP_DIR}/lib/frameworks.sh"
+source "${BUILDPACK_DIR}/lib/frameworks.sh"
 
 echo "---"
 
-if has_postgres "${BUILD_DIR}"; then
+if frameworks::has_postgres "${BUILD_DIR}"; then
 	cat <<EOF
 addons:
   - heroku-postgresql
@@ -21,22 +20,22 @@ EOF
 fi
 
 if [ ! -f "${BUILD_DIR}/Procfile" ] && [ -d "${BUILD_DIR}/target" ]; then
-	if is_quarkus "${BUILD_DIR}"; then
+	if frameworks::is_quarkus "${BUILD_DIR}"; then
 		echo "default_process_types:"
 		echo "  web: java -Dquarkus.http.port=\$PORT \$JAVA_OPTS -jar target/quarkus-app/quarkus-run.jar"
 	else
 		cd "${BUILD_DIR}"
 		# shellcheck disable=SC2044
-		for jarFile in $(find target -maxdepth 1 -name "*.jar" -type f -exec ls -S {} +); do
-			if is_spring_boot "${BUILD_DIR}"; then
+		for jar_file in $(find target -maxdepth 1 -name "*.jar" -type f -exec ls -S {} +); do
+			if frameworks::is_spring_boot "${BUILD_DIR}"; then
 				echo "default_process_types:"
-				echo "  web: java -Dserver.port=\$PORT \$JAVA_OPTS -jar ${jarFile}"
-			elif is_wildfly_swarm "${BUILD_DIR}"; then
+				echo "  web: java -Dserver.port=\$PORT \$JAVA_OPTS -jar ${jar_file}"
+			elif frameworks::is_wildfly_swarm "${BUILD_DIR}"; then
 				echo "default_process_types:"
-				echo "  web: java -Dswarm.http.port=\$PORT \$JAVA_OPTS -jar ${jarFile}"
-			elif is_micronaut "${BUILD_DIR}"; then
+				echo "  web: java -Dswarm.http.port=\$PORT \$JAVA_OPTS -jar ${jar_file}"
+			elif frameworks::is_micronaut "${BUILD_DIR}"; then
 				echo "default_process_types:"
-				echo "  web: java -Dmicronaut.server.port=\$PORT \$JAVA_OPTS -jar ${jarFile}"
+				echo "  web: java -Dmicronaut.server.port=\$PORT \$JAVA_OPTS -jar ${jar_file}"
 			fi
 			break
 		done
diff --git a/bin/test b/bin/test
index 8671981..424c60b 100755
--- a/bin/test
+++ b/bin/test
@@ -1,19 +1,17 @@
 #!/usr/bin/env bash
-# bin/test <build-dir> <env-dir> <artifact-dir>
-
-# fail fast
 set -e
 
-BP_DIR=$(
+BUILD_DIR="${1}"
+ENV_DIR="${2}"
+
+BUILDPACK_DIR=$(
 	cd "$(dirname "${0}")"/..
 	pwd
 )
-BUILD_DIR=$1
-ENV_DIR=$2
 
-source "${BP_DIR}/lib/util.sh"
-source "${BP_DIR}/lib/common.sh"
-source "${BP_DIR}/lib/maven.sh"
+source "${BUILDPACK_DIR}/lib/util.sh"
+source "${BUILDPACK_DIR}/lib/common.sh"
+source "${BUILDPACK_DIR}/lib/maven.sh"
 
 export_env_dir "${ENV_DIR}" "." "JAVA_OPTS|JAVA_TOOL_OPTIONS"
 
diff --git a/bin/test-compile b/bin/test-compile
index 900b00e..ff6f70f 100755
--- a/bin/test-compile
+++ b/bin/test-compile
@@ -1,20 +1,18 @@
 #!/usr/bin/env bash
-# bin/test-compile <build-dir> <cache-dir> <env-dir>
-
-# fail fast
 set -e
 
-BP_DIR=$(
+BUILD_DIR="${1}"
+CACHE_DIR="${2}"
+ENV_DIR="${3}"
+
+BUILDPACK_DIR=$(
 	cd "$(dirname "${0}")"/..
 	pwd
 )
-BUILD_DIR=$1
-CACHE_DIR=$2
-ENV_DIR=$3
 
-source "${BP_DIR}/lib/util.sh"
-source "${BP_DIR}/lib/common.sh"
-source "${BP_DIR}/lib/maven.sh"
+source "${BUILDPACK_DIR}/lib/util.sh"
+source "${BUILDPACK_DIR}/lib/common.sh"
+source "${BUILDPACK_DIR}/lib/maven.sh"
 
 export_env_dir "${ENV_DIR}" "." "JAVA_OPTS|JAVA_TOOL_OPTIONS"
 
diff --git a/lib/common.sh b/lib/common.sh
index 153bc69..7dfaec3 100644
--- a/lib/common.sh
+++ b/lib/common.sh
@@ -3,18 +3,18 @@
 export DEFAULT_MAVEN_VERSION="3.9.4"
 
 install_maven() {
-	local installDir=$1
-	local buildDir=$2
-	mavenHome=$installDir/.maven
+	local install_dir="${1}"
+	local build_dir="${2}"
+	local maven_home="${install_dir}/.maven"
 
-	definedMavenVersion=$(detect_maven_version "${buildDir}")
+	defined_maven_version=$(detect_maven_version "${build_dir}")
 
-	mavenVersion=${definedMavenVersion:-$DEFAULT_MAVEN_VERSION}
+	maven_version=${defined_maven_version:-$DEFAULT_MAVEN_VERSION}
 
-	status_pending "Installing Maven ${mavenVersion}"
-	local mavenUrl="https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/${mavenVersion}/apache-maven-${mavenVersion}-bin.tar.gz"
-	if is_supported_maven_version "${mavenVersion}" "${mavenUrl}"; then
-		download_maven "${mavenUrl}" "${mavenHome}"
+	status_pending "Installing Maven ${maven_version}"
+	local maven_url="https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/${maven_version}/apache-maven-${maven_version}-bin.tar.gz"
+	if is_supported_maven_version "${maven_version}" "${maven_url}"; then
+		download_maven "${maven_url}" "${maven_home}"
 		status_done
 	else
 		error_return "Error, you have defined an unsupported Maven version in the system.properties file.
@@ -24,21 +24,21 @@ The default supported version is ${DEFAULT_MAVEN_VERSION}"
 }
 
 download_maven() {
-	local mavenUrl=$1
-	local installDir=$2
+	local maven_url=$1
+	local install_dir=$2
 
-	rm -rf "${installDir}"
-	mkdir -p "${installDir}"
-	curl --fail --retry 3 --retry-connrefused --connect-timeout 5 --silent --max-time 60 --location "${mavenUrl}" | tar -xzm --strip-components 1 -C "${installDir}"
-	chmod +x "${installDir}/bin/mvn"
+	rm -rf "${install_dir}"
+	mkdir -p "${install_dir}"
+	curl --fail --retry 3 --retry-connrefused --connect-timeout 5 --silent --max-time 60 --location "${maven_url}" | tar -xzm --strip-components 1 -C "${install_dir}"
+	chmod +x "${install_dir}/bin/mvn"
 }
 
 is_supported_maven_version() {
-	local mavenVersion=${1}
-	local mavenUrl=${2:?}
-	if [ "$mavenVersion" = "$DEFAULT_MAVEN_VERSION" ]; then
+	local maven_version=${1}
+	local maven_url=${2:?}
+	if [ "$maven_version" = "$DEFAULT_MAVEN_VERSION" ]; then
 		return 0
-	elif curl -I --retry 3 --retry-connrefused --connect-timeout 5 --fail --silent --max-time 5 --location "${mavenUrl}" >/dev/null; then
+	elif curl -I --retry 3 --retry-connrefused --connect-timeout 5 --fail --silent --max-time 5 --location "${maven_url}" >/dev/null; then
 		return 0
 	else
 		return 1
@@ -46,11 +46,11 @@ is_supported_maven_version() {
 }
 
 detect_maven_version() {
-	local baseDir=${1}
-	if [ -f "${baseDir}/system.properties" ]; then
-		mavenVersion=$(get_app_system_value "${baseDir}/system.properties" "maven.version")
-		if [ -n "$mavenVersion" ]; then
-			echo "${mavenVersion}"
+	local base_dir=${1}
+	if [ -f "${base_dir}/system.properties" ]; then
+		maven_version=$(get_app_system_value "${base_dir}/system.properties" "maven.version")
+		if [ -n "$maven_version" ]; then
+			echo "${maven_version}"
 		else
 			echo ""
 		fi
diff --git a/lib/frameworks.sh b/lib/frameworks.sh
index d99aa85..a4d1a15 100644
--- a/lib/frameworks.sh
+++ b/lib/frameworks.sh
@@ -1,36 +1,36 @@
 #!/usr/bin/env bash
 
-is_spring_boot() {
-	local buildDir=${1:?}
-	test -f "${buildDir}/pom.xml" &&
-		test -n "$(grep "<groupId>org.springframework.boot" "${buildDir}/pom.xml")" &&
-		test -n "$(grep "<artifactId>spring-boot" "${buildDir}/pom.xml")"
+frameworks::is_spring_boot() {
+	local build_dir=${1:?}
+	test -f "${build_dir}/pom.xml" &&
+		test -n "$(grep "<groupId>org.springframework.boot" "${build_dir}/pom.xml")" &&
+		test -n "$(grep "<artifactId>spring-boot" "${build_dir}/pom.xml")"
 }
 
-is_wildfly_swarm() {
-	local buildDir=${1:?}
-	test -f "${buildDir}/pom.xml" &&
-		test -n "$(grep "<groupId>org.wildfly.swarm" "${buildDir}/pom.xml")"
+frameworks::is_wildfly_swarm() {
+	local build_dir=${1:?}
+	test -f "${build_dir}/pom.xml" &&
+		test -n "$(grep "<groupId>org.wildfly.swarm" "${build_dir}/pom.xml")"
 }
 
-is_micronaut() {
-	local buildDir=${1:?}
-	test -f "${buildDir}/pom.xml" &&
-		test -n "$(grep "<groupId>io.micronaut" "${buildDir}/pom.xml")"
+frameworks::is_micronaut() {
+	local build_dir=${1:?}
+	test -f "${build_dir}/pom.xml" &&
+		test -n "$(grep "<groupId>io.micronaut" "${build_dir}/pom.xml")"
 }
 
-is_quarkus() {
-	local buildDir=${1:?}
-	test -f "${buildDir}/pom.xml" &&
-		test -n "$(grep "<groupId>io.quarkus" "${buildDir}/pom.xml")"
+frameworks::is_quarkus() {
+	local build_dir=${1:?}
+	test -f "${build_dir}/pom.xml" &&
+		test -n "$(grep "<groupId>io.quarkus" "${build_dir}/pom.xml")"
 }
 
-has_postgres() {
-	local buildDir=${1:?}
+frameworks::has_postgres() {
+	local build_dir=${1:?}
 	# shellcheck disable=SC2235
-	test -f "${buildDir}/pom.xml" && (
-		test -n "$(grep "<groupId>org.postgresql" "${buildDir}/pom.xml")" ||
-			test -n "$(grep "<groupId>postgresql" "${buildDir}/pom.xml")" ||
-			test -n "$(grep "<groupId>com.impossibl.pgjdbc-ng" "${buildDir}/pom.xml")"
+	test -f "${build_dir}/pom.xml" && (
+		test -n "$(grep "<groupId>org.postgresql" "${build_dir}/pom.xml")" ||
+			test -n "$(grep "<groupId>postgresql" "${build_dir}/pom.xml")" ||
+			test -n "$(grep "<groupId>com.impossibl.pgjdbc-ng" "${build_dir}/pom.xml")"
 	)
 }
diff --git a/lib/maven.sh b/lib/maven.sh
index 7a2437c..2b9f9c7 100644
--- a/lib/maven.sh
+++ b/lib/maven.sh
@@ -30,16 +30,16 @@ _mvn_cmd_opts() {
 
 _mvn_settings_opt() {
 	local home="${1}"
-	local mavenInstallDir="${2}"
+	local maven_install_dir="${2}"
 
 	if [ -n "$MAVEN_SETTINGS_PATH" ]; then
 		echo -n "-s $MAVEN_SETTINGS_PATH"
 	elif [ -n "$MAVEN_SETTINGS_URL" ]; then
-		local settingsXml="${mavenInstallDir}/.m2/settings.xml"
-		mkdir -p "$(dirname "${settingsXml}")"
-		curl --retry 3 --retry-connrefused --connect-timeout 5 --silent --max-time 10 --location "${MAVEN_SETTINGS_URL}" --output "${settingsXml}"
-		if [ -f "${settingsXml}" ]; then
-			echo -n "-s ${settingsXml}"
+		local settings_xml="${maven_install_dir}/.m2/settings.xml"
+		mkdir -p "$(dirname "${settings_xml}")"
+		curl --retry 3 --retry-connrefused --connect-timeout 5 --silent --max-time 10 --location "${MAVEN_SETTINGS_URL}" --output "${settings_xml}"
+		if [ -f "${settings_xml}" ]; then
+			echo -n "-s ${settings_xml}"
 		else
 			error "Could not download settings.xml from the URL defined in MAVEN_SETTINGS_URL!"
 			return 1
@@ -63,8 +63,8 @@ has_maven_wrapper() {
 }
 
 get_cache_status() {
-	local cacheDir=${1}
-	if [ ! -d "${cacheDir}/.m2" ]; then
+	local cache_dir=${1}
+	if [ ! -d "${cache_dir}/.m2" ]; then
 		echo "not-found"
 	else
 		echo "valid"
@@ -74,41 +74,41 @@ get_cache_status() {
 run_mvn() {
 	local scope=${1}
 	local home=${2}
-	local mavenInstallDir=${3}
+	local maven_install_dir=${3}
 
-	mkdir -p "${mavenInstallDir}"
+	mkdir -p "${maven_install_dir}"
 	if has_maven_wrapper "${home}"; then
-		cache_copy ".m2/wrapper" "${mavenInstallDir}" "${home}"
+		cache_copy ".m2/wrapper" "${maven_install_dir}" "${home}"
 		chmod +x "${home}/mvnw"
-		local mavenExe="./mvnw"
+		local maven_exe="./mvnw"
 	else
 		# shellcheck disable=SC2164
-		cd "${mavenInstallDir}"
+		cd "${maven_install_dir}"
 
-		install_maven "${mavenInstallDir}" "${home}"
-		PATH="${mavenInstallDir}/.maven/bin:$PATH"
-		local mavenExe="mvn"
+		install_maven "${maven_install_dir}" "${home}"
+		PATH="${maven_install_dir}/.maven/bin:$PATH"
+		local maven_exe="mvn"
 		# shellcheck disable=SC2164
 		cd "${home}"
 	fi
 
 	local mvn_settings_opt
-	mvn_settings_opt="$(_mvn_settings_opt "${home}" "${mavenInstallDir}")"
+	mvn_settings_opt="$(_mvn_settings_opt "${home}" "${maven_install_dir}")"
 
-	MAVEN_OPTS="$(_mvn_java_opts "${scope}" "${home}" "${mavenInstallDir}")"
+	MAVEN_OPTS="$(_mvn_java_opts "${scope}" "${home}" "${maven_install_dir}")"
 	export MAVEN_OPTS
 
 	# shellcheck disable=SC2164
 	cd "${home}"
-	local mvnOpts
-	mvnOpts="$(_mvn_cmd_opts "${scope}")"
+	local mvn_opts
+	mvn_opts="$(_mvn_cmd_opts "${scope}")"
 
 	status "Executing Maven"
-	echo "$ ${mavenExe} ${mvnOpts}" | indent
+	echo "$ ${maven_exe} ${mvn_opts}" | indent
 
-	# We rely on word splitting for mvn_settings_opt and mvnOpts:
+	# We rely on word splitting for mvn_settings_opt and mvn_opts:
 	# shellcheck disable=SC2086
-	if ! ${mavenExe} -DoutputFile=target/mvn-dependency-list.log -B ${mvn_settings_opt} ${mvnOpts} | indent; then
+	if ! ${maven_exe} -DoutputFile=target/mvn-dependency-list.log -B ${mvn_settings_opt} ${mvn_opts} | indent; then
 		error "Failed to build app with Maven
 We're sorry this build is failing! If you can't find the issue in application code,
 please submit a ticket so we can help: https://help.heroku.com/"
@@ -129,9 +129,9 @@ write_mvn_profile() {
 
 remove_mvn() {
 	local home=${1}
-	local mavenInstallDir=${2}
+	local maven_install_dir=${2}
 	if has_maven_wrapper "${home}"; then
-		cache_copy ".m2/wrapper" "$home" "$mavenInstallDir"
+		cache_copy ".m2/wrapper" "$home" "$maven_install_dir"
 		rm -rf "$home/.m2"
 	fi
 }