When trying to start tomcat I get this error. What could be the cause of this?
I\'ve go through a bunch of similar posts and I can\'t find anything.
I am usi
Your jars are completely messed up:
Tomcat indeed has problems (See bug #60087) with verifying jar file signatures.
Update Apache Tomcat version.
You might verify signature of files manually, if you read Verifying Signed JAR Files, before deploying app to the Tomcat server.
You might also have corrupted jar files downloaded. You should always download from known sources or repositories.
You can also download along with jar file the digest signature files and verify contents of the file with OS utility.
Don't use malicious sites hosted jar files for your download.
Use antivirus to scan for viruses inside jar and verify signature. Some antivirus's have bugs and you should not use its result report for final decision about file contents. E.g. Error: "Invalid sha1 signature file digest for" when verifying a Jar file.