Distribution should not contain Jacoco instrumented classes

[haumacher]

I built the lib myself with mvn install and got an unusable version that caused a NoClassDefFoundError when deployed to a Tomcat web container:

java.lang.NoClassDefFoundError: org/jacoco/agent/rt/internal_c13123e/Offline
	org.simplejavamail.utils.mail.dkim.DkimSigner.$jacocoInit(DkimSigner.java)
	org.simplejavamail.utils.mail.dkim.DkimSigner.<clinit>(DkimSigner.java)
	de.haumacher.phoneblock.mail.MailSignature.createSigner(MailSignature.java:19)
	de.haumacher.phoneblock.mail.MailService.dkimSignMessage(MailService.java:272)
	de.haumacher.phoneblock.mail.MailService.sendMail(MailService.java:255)
	de.haumacher.phoneblock.mail.MailService.sendMail(MailService.java:238)
	de.haumacher.phoneblock.mail.MailService.sendActivationMail(MailService.java:126)
	de.haumacher.phoneblock.app.EMailVerificationServlet.doPost(EMailVerificationServlet.java:70)
	jakarta.servlet.http.HttpServlet.service(HttpServlet.java:590)
	jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658)
	org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
	de.haumacher.phoneblock.app.CacheControlFilter.doFilter(CacheControlFilter.java:46)
	de.haumacher.phoneblock.app.RememberedLoginFilter.requestLogin(RememberedLoginFilter.java:22)
	de.haumacher.phoneblock.app.LoginFilter.doFilter(LoginFilter.java:121)
	de.haumacher.phoneblock.app.ContentSecurityPolicyFilter.doFilter(ContentSecurityPolicyFilter.java:24)
	de.haumacher.phoneblock.app.ContentTypeOptionFilter.doFilter(ContentTypeOptionFilter.java:27)

I don't know, whether this issue also exists in the official distribution, since I was not able to use this due to Issue #5. But by default, I don't think that instrumented classes should be installed.

I was able to fix this by adding

<jacoco.skip>true</jacoco.skip>

to the properties section - but I don't know, whether this is the "ultimate" solution.