chore: update to work around NPE

Author: dmaccormack

script/version_snapshot.sh

@@ -1,6 +1,53 @@
 #!/bin/sh
 
-mvn -B versions:set -DnewVersion=`sed -n 's/^parent.version=//p' snapshot.properties` -DartifactId=parent
+PARENT_VERSION=`sed -n 's/^parent.version=//p' snapshot.properties`
+MODULE_VERSION=`sed -n 's/^module.version=//p' snapshot.properties`
+PARENT_VERSION_DEFAULT="1-SNAPSHOT"
+MODULE_VERSION_DEFAULT="1.0.0-SNAPSHOT"
+GROUP_ID="org.jsonurl"
+M2_REPO="$HOME/.m2/repository/org/jsonurl"
 
-mvn -B versions:set -DnewVersion=`sed -n 's/^module.version=//p' snapshot.properties` -DartifactId='*' -DprocessParent=false
+test -d "$M2_REPO" && rm -fr "$M2_REPO" && echo "removed files from m2"
+
+#
+# install the parent so that 1-SNAPSHOT is still available for the
+# children after I change the parent's version
+#
+(cd module && mvn -B install || exit 1) || exit 1
+
+#
+# set the project version of the parent
+#   the ``cd'' is necessary to bypass a NPE in the maven versions plugin
+#
+(cd module && mvn -B versions:set \
+	-DnewVersion="$PARENT_VERSION" \
+	-DgroupId="$GROUP_ID" \
+	-DartifactId='parent' \
+	-DoldVersion="$PARENT_VERSION_DEFAULT"  \
+	-DprocessProject=true \
+	-DprocessParent=false \
+|| exit 1) || exit 1
+
+#
+# install the parent again so the new version is available for the call to
+# ``update-parent'' below
+#
+(cd module && mvn -B install || exit 1) || exit 1
+
+# set the parent version for all modules
+mvn -B versions:update-parent \
+	-DparentVersion="$PARENT_VERSION" \
+	-DallowSnapshots=true || exit 1
+
+# set the project version for all modules
+mvn -B versions:set \
+	-DnewVersion="$MODULE_VERSION" \
+	-DgroupId="$GROUP_ID" \
+	-DartifactId='*' \
+	-DoldVersion="$MODULE_VERSION_DEFAULT" \
+	-DprocessAllModules=true \
+	-DprocessProject=true \
+	-DprocessParent=false || exit 1
+
+test -d "$M2_REPO" && rm -fr "$M2_REPO" && echo "removed files from m2"