Fix the wrapper file. Add a pidfile to the systemd unit

templates/nexus.service.j2

@@ -5,7 +5,9 @@ After=network.target
 [Service]
 Type=forking
 LimitNOFILE=65536
+PIDFile={{ nexus_webapp_dir }}/bin/jsw/linux-x86-64/nexus.pid
 ExecStart={{ nexus_webapp_dir }}/bin/nexus start
+ExecReload={{ nexus_webapp_dir }}/bin/nexus restart
 ExecStop={{ nexus_webapp_dir }}/bin/nexus stop
 User={{ nexus_user }}
 Restart=on-abort

templates/wrapper.conf.j2

@@ -1,4 +1,33 @@
+# JSW Configuration file
+#
+# For complete coverage of available configuration, please go here:
+# http://wrapper.tanukisoftware.org/doc/english/properties.html
+#
+# Some "most often used" keywords are added to end of this file
+# to be used as a "guideline". They are NOT the complete list of
+# keywords.
 
+# Set the JSW working directory (used as base for resolving relative paths)
+wrapper.working.dir=../../..
+
+# Set the JVM executable
+# (modify this to absolute path if you need a Java that is not on the OS path)
+wrapper.java.command=java
+
+# The main class that JSW will execute within JVM
+wrapper.java.mainclass=org.codehaus.plexus.classworlds.launcher.Launcher
+
+# The JVM classpath
+wrapper.java.classpath.1=bin/jsw/lib/wrapper-3.2.3.jar
+wrapper.java.classpath.2=./lib/plexus-classworlds-*.jar
+wrapper.java.classpath.3=./conf/
+
+# The library path
+wrapper.java.library.path.1=bin/jsw/lib
+
+# Additional JVM parameters (tune if needed, but match the sequence of numbers!)
+wrapper.java.additional.1=-Dsun.net.inetaddr.ttl=3600
+wrapper.java.additional.2=-DbundleBasedir=.
 wrapper.java.additional.3=-Dcom.sun.jndi.ldap.connect.pool.protocol="plain ssl"
 wrapper.java.additional.3.stripquotes=TRUE
 #wrapper.java.additional.4=-Xdebug