{title:'Logging and Debugging', created:'8.2.0', updated:'9.0.0'}

The following methods provide logging of requests and responses:

- {@link oajrc.RestClient.Builder}
  - {@link oajrc.RestClient.Builder#logger(Logger) logger(Logger)}
  - {@link oajrc.RestClient.Builder#logToConsole() logToConsole()}
  - {@link oajrc.RestClient.Builder#logRequests(DetailLevel,Level,BiPredicate) logRequests(DetailLevel,Level,BiPredicate)}

The following example shows the results of logging all requests that end with /bean.

##### Examples:

| // A simple bean we're going to round-trip. | MyBean bean = new MyBean(); | | bean = RestClient | .create() | .json5() | .logRequests(DetailLevel.FULL, Level.SEVERE, (req,res)->req.getUri().endsWith("/bean")) | .logToConsole() | .build() | .post("http://localhost/bean", bean) | .run() | .getContent().as(MyBean.class);

This produces the following console output:

| === HTTP Call (outgoing) ====================================================== | === REQUEST === | POST http://localhost/bean | ---request headers--- | Accept: application/json5 | ---request entity--- | Content-Type: application/json5 | ---request content--- | {f:1} | === RESPONSE === | HTTP/1.1 200 | ---response headers--- | Content-Type: application/json | ---response content--- | {f:1} | === END =======================================================================",

It should be noted that if you enable request logging detail level {@link oaj.DetailLevel#FULL}, response bodies will be cached by default which may introduce a performance penalty.

Additionally, the following method is also provided for enabling debug mode:

- {@link oajrc.RestClient.Builder}
  - {@link oajrc.RestClient.Builder#debug() debug()}

Enabling debug mode has the following effects:

- {@link oajrc.RestClient.Builder#logToConsole()} is called.