Fix panic when restarting the application (#306)

* Fix panic when restarting the application

* update doc

* typo

Author: wyfo

zenoh-jni/src/logger.rs

@@ -23,6 +23,7 @@ use crate::{errors::ZResult, throw_exception, zerror};
 ///
 /// This function is meant to be called from Java/Kotlin code through JNI. It takes a `filter`
 /// indicating the desired log level.
+/// If the logger was already initialized in a previous call, then it does nothing.
 ///
 /// See https://docs.rs/env_logger/latest/env_logger/index.html for accepted filter format.
 ///
@@ -47,7 +48,8 @@ pub extern "C" fn Java_io_zenoh_Logger_00024Companion_startLogsViaJNI(
             .parse_filters(log_level.as_str())
             .tag_target_strip()
             .prepend_module(true)
-            .init();
+            .try_init()
+            .ok();
         Ok(())
     }()
     .unwrap_or_else(|err| throw_exception!(env, err))