limiting java ssl debug logging

Question

Using JVM flag

-Djavax.net.debug=ssl

is producing a tremendous ammount of logging, the details for every SSL event on the server. Is there anyway to only have it log errors? or possibly there is some better subset of these flags that produce tidier output

all            turn on all debugging
ssl            turn on ssl debugging

The following can be used with ssl:

    record       enable per-record tracing
    handshake    print each handshake message
    keygen       print key generation data
    session      print session activity
    defaultctx   print default SSL initialization
    sslctx       print SSLContext tracing
    sessioncache print session cache tracing
    keymanager   print key manager tracing
    trustmanager print trust manager tracing
    pluggability print pluggability tracing

    handshake debugging can be widened with:
    data         hex dump of each handshake message
    verbose      verbose handshake message printing

    record debugging can be widened with:
    plaintext    hex dump of record plaintext
    packet       print raw SSL/TLS packets

I believe you get the errors for free by way of exceptions. No specials actions are necessary. — jww
This is specifically used for debugging. Hence the vast amount of logs. — javajavajava

Alan MacK Alan MacK · Accepted Answer · 2015-05-07T14:51:10

The format for using the additional ssl flags is ssl:[flag] for example:

-Djavax.net.debug=ssl:record or -Djavax.net.debug=ssl:handshake.

limiting java ssl debug logging

2 Answers