diff --git a/README.md b/README.md
index ed3bfe1..b97c92b 100644
--- a/README.md
+++ b/README.md
@@ -16,11 +16,19 @@ public class Main {
     }
 }
 ```
-* run it with (adjust paths): 
+Requirements
+* java22 
+* rust
+
+Start rest service 
 ``` bash
 cd api; RUST_LOG=info cargo run
 ```
 
+Start your java with 
 ```
-java22 -javaagent:$EXCEPTIONAL_PROJECT/exceptional/agent/target/exceptional-agent-1.0-SNAPSHOT.jar --enable-preview -classpath $YOUR_CLASSPATH Main
+java22 -javaagent:$EXCEPTIONAL_PROJECT/exceptional/agent/target/exceptional-agent-1.0-SNAPSHOT.jar 
+-Dagentlib="$EXCEPTIONAL_PROJECT/rustlib/target/debug/librustlib.dylib"
+--enable-preview --enable-native-access=ALL-UNNAMED 
+-classpath $YOUR_CLASSPATH YourMain
 ```
diff --git a/lib/src/main/java/com/github/shautvast/exceptional/CircularBufferWriter.java b/lib/src/main/java/com/github/shautvast/exceptional/CircularBufferWriter.java
index 937b5af..bc26025 100644
--- a/lib/src/main/java/com/github/shautvast/exceptional/CircularBufferWriter.java
+++ b/lib/src/main/java/com/github/shautvast/exceptional/CircularBufferWriter.java
@@ -38,7 +38,12 @@ public class CircularBufferWriter implements AutoCloseable {
             arena = Arena.ofConfined();
             linker = Linker.nativeLinker();
             //TODO relative path, or configurable
-            rustlib = SymbolLookup.libraryLookup(System.getProperty("agentlib"), arena);
+            String agentlibPath = System.getProperty("agentlib");
+            if (agentlibPath == null) {
+                System.err.println("Please specify an agent library with -Dagentlib=<path to native agent>");
+                System.exit(-1);
+            }
+            rustlib = SymbolLookup.libraryLookup(agentlibPath, arena);
             MemorySegment create = rustlib.find("buffer_updated").orElseThrow();
             var updateHandle = linker.downcallHandle(create, FunctionDescriptor.ofVoid(
                     ValueLayout.ADDRESS
diff --git a/lib/src/test/java/com/github/shautvast/exceptional/ExceptionLoggerTest.java b/lib/src/test/java/com/github/shautvast/exceptional/ExceptionLoggerTest.java
index f8d6370..527e0a8 100644
--- a/lib/src/test/java/com/github/shautvast/exceptional/ExceptionLoggerTest.java
+++ b/lib/src/test/java/com/github/shautvast/exceptional/ExceptionLoggerTest.java
@@ -2,19 +2,11 @@ package com.github.shautvast.exceptional;
 
 import org.junit.jupiter.api.Test;
 
-import java.util.concurrent.TimeUnit;
-
 class ExceptionLoggerTest {
 
     @Test
-    void test() throws InterruptedException {
-        long t0 = System.currentTimeMillis();
-        for (int i = 0; i < 1_000; i++) {
-            ExceptionLogger.log(new Throwable());
-            TimeUnit.MILLISECONDS.sleep(1);
-        }
-        System.out.println(System.currentTimeMillis() - t0);
-        Thread.sleep(10000);
+    void test() {
+        ExceptionLogger.log(new Throwable());
     }
 
 }
\ No newline at end of file
diff --git a/rustlib/Cargo.lock b/rustlib/Cargo.lock
index 61ae06e..b64fd83 100644
--- a/rustlib/Cargo.lock
+++ b/rustlib/Cargo.lock
@@ -17,6 +17,15 @@ version = "1.0.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
 
+[[package]]
+name = "aho-corasick"
+version = "1.1.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8e60d3430d3a69478ad0993f19238d2df97c507009a52b3c10addcd7f6bcb916"
+dependencies = [
+ "memchr",
+]
+
 [[package]]
 name = "android-tzdata"
 version = "0.1.1"
@@ -137,31 +146,6 @@ version = "0.8.6"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "06ea2b9bc92be3c2baa9334a323ebca2d6f074ff852cd1d7b11064035cd3868f"
 
-[[package]]
-name = "crossbeam-deque"
-version = "0.8.5"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "613f8cc01fe9cf1a3eb3d7f488fd2fa8388403e97039e2f73692932e291a770d"
-dependencies = [
- "crossbeam-epoch",
- "crossbeam-utils",
-]
-
-[[package]]
-name = "crossbeam-epoch"
-version = "0.9.18"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5b82ac4a3c2ca9c3460964f020e1402edd5753411d7737aa39c3714ad1b5420e"
-dependencies = [
- "crossbeam-utils",
-]
-
-[[package]]
-name = "crossbeam-utils"
-version = "0.8.20"
-source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "22ec99545bb0ed0ea7bb9b8e1e9122ea386ff8a48c0922e43f36d45ab09e0e80"
-
 [[package]]
 name = "encoding_rs"
 version = "0.8.34"
@@ -492,6 +476,12 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "lazy_static"
+version = "1.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bbd2bcb4c963f2ddae06a2efc7e9f3591312473c50c6685e1f298068316e66fe"
+
 [[package]]
 name = "libc"
 version = "0.2.155"
@@ -510,6 +500,15 @@ version = "0.4.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "a7a70ba024b9dc04c27ea2f0c0548feb474ec5c54bba33a7f72f873a39d07b24"
 
+[[package]]
+name = "matchers"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8263075bb86c5a1b1427b5ae862e8889656f126e9f77c484496e8b47cf5c5558"
+dependencies = [
+ "regex-automata 0.1.10",
+]
+
 [[package]]
 name = "memchr"
 version = "2.7.4"
@@ -559,6 +558,16 @@ dependencies = [
  "tempfile",
 ]
 
+[[package]]
+name = "nu-ansi-term"
+version = "0.46.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "77a8165726e8236064dbb45459242600304b42a5ea24ee2948e18e023bf7ba84"
+dependencies = [
+ "overload",
+ "winapi",
+]
+
 [[package]]
 name = "num-traits"
 version = "0.2.19"
@@ -627,6 +636,12 @@ dependencies = [
  "vcpkg",
 ]
 
+[[package]]
+name = "overload"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b15813163c1d831bf4a13c3610c05c0d03b39feb07f7e09fa234dac9b15aaf39"
+
 [[package]]
 name = "percent-encoding"
 version = "2.3.1"
@@ -689,6 +704,50 @@ dependencies = [
  "proc-macro2",
 ]
 
+[[package]]
+name = "regex"
+version = "1.10.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b91213439dad192326a0d7c6ee3955910425f441d7038e0d6933b0aec5c4517f"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-automata 0.4.7",
+ "regex-syntax 0.8.4",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6c230d73fb8d8c1b9c0b3135c5142a8acee3a0558fb8db5cf1cb65f8d7862132"
+dependencies = [
+ "regex-syntax 0.6.29",
+]
+
+[[package]]
+name = "regex-automata"
+version = "0.4.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "38caf58cc5ef2fed281f89292ef23f6365465ed9a41b7a7754eb4e26496c92df"
+dependencies = [
+ "aho-corasick",
+ "memchr",
+ "regex-syntax 0.8.4",
+]
+
+[[package]]
+name = "regex-syntax"
+version = "0.6.29"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f162c6dd7b008981e4d40210aca20b4bd0f9b60ca9271061b07f78537722f2e1"
+
+[[package]]
+name = "regex-syntax"
+version = "0.8.4"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7a66a03ae7c801facd77a29370b4faec201768915ac14a721ba36f20bc9c209b"
+
 [[package]]
 name = "reqwest"
 version = "0.12.5"
@@ -773,8 +832,9 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "chrono",
- "crossbeam-deque",
  "reqwest",
+ "tracing",
+ "tracing-subscriber",
 ]
 
 [[package]]
@@ -898,6 +958,15 @@ dependencies = [
  "serde",
 ]
 
+[[package]]
+name = "sharded-slab"
+version = "0.1.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f40ca3c46823713e0d4209592e8d6e826aa57e928f09752619fc696c499637f6"
+dependencies = [
+ "lazy_static",
+]
+
 [[package]]
 name = "slab"
 version = "0.4.9"
@@ -985,6 +1054,16 @@ dependencies = [
  "windows-sys 0.52.0",
 ]
 
+[[package]]
+name = "thread_local"
+version = "1.1.8"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "8b9ef9bad013ada3808854ceac7b46812a6465ba368859a37e2100283d2d719c"
+dependencies = [
+ "cfg-if",
+ "once_cell",
+]
+
 [[package]]
 name = "tinyvec"
 version = "1.6.1"
@@ -1083,9 +1162,21 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c3523ab5a71916ccf420eebdf5521fcef02141234bbc0b8a49f2fdc4544364ef"
 dependencies = [
  "pin-project-lite",
+ "tracing-attributes",
  "tracing-core",
 ]
 
+[[package]]
+name = "tracing-attributes"
+version = "0.1.27"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "34704c8d6ebcbc939824180af020566b01a7c01f80641264eba0999f6c2b6be7"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn",
+]
+
 [[package]]
 name = "tracing-core"
 version = "0.1.32"
@@ -1093,6 +1184,36 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c06d3da6113f116aaee68e4d601191614c9053067f9ab7f6edbcb161237daa54"
 dependencies = [
  "once_cell",
+ "valuable",
+]
+
+[[package]]
+name = "tracing-log"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ee855f1f400bd0e5c02d150ae5de3840039a3f54b025156404e34c23c03f47c3"
+dependencies = [
+ "log",
+ "once_cell",
+ "tracing-core",
+]
+
+[[package]]
+name = "tracing-subscriber"
+version = "0.3.18"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ad0f048c97dbd9faa9b7df56362b8ebcaa52adb06b498c050d2f4e32f90a7a8b"
+dependencies = [
+ "matchers",
+ "nu-ansi-term",
+ "once_cell",
+ "regex",
+ "sharded-slab",
+ "smallvec",
+ "thread_local",
+ "tracing",
+ "tracing-core",
+ "tracing-log",
 ]
 
 [[package]]
@@ -1139,6 +1260,12 @@ dependencies = [
  "percent-encoding",
 ]
 
+[[package]]
+name = "valuable"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "830b7e5d4d90034032940e4ace0d9a9a057e7a45cd94e6c007832e39edb82f6d"
+
 [[package]]
 name = "vcpkg"
 version = "0.2.15"
@@ -1236,6 +1363,28 @@ dependencies = [
  "wasm-bindgen",
 ]
 
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
+
 [[package]]
 name = "windows-core"
 version = "0.52.0"
diff --git a/rustlib/Cargo.toml b/rustlib/Cargo.toml
index d4a0c8c..0f0dcad 100644
--- a/rustlib/Cargo.toml
+++ b/rustlib/Cargo.toml
@@ -11,4 +11,5 @@ bench = false
 anyhow = "1.0"
 chrono = "0.4"
 reqwest = { version = "0.12", features = ["blocking"]}
-crossbeam-deque = "0.8"
\ No newline at end of file
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
diff --git a/rustlib/src/lib.rs b/rustlib/src/lib.rs
index de44d57..3f67226 100644
--- a/rustlib/src/lib.rs
+++ b/rustlib/src/lib.rs
@@ -3,6 +3,7 @@ use std::ffi::c_char;
 use std::slice;
 
 use reqwest::blocking::Client;
+use tracing::error;
 
 // same value, but different meanings
 // TODO find a way to set the buffer size from java.
@@ -42,10 +43,9 @@ pub extern "C" fn buffer_updated(buffer: *mut c_char) {
     if len <= remaining {
         unsafe {
             let result = std::str::from_utf8_unchecked(slice::from_raw_parts(buffer.offset(read_pos).cast::<u8>(), len as usize));
-            client.post("http://localhost:3000/api/stacktraces")
+            _ = client.post("http://localhost:3000/api/stacktraces")
                 .body(result)
                 .send()
-                .unwrap();
         }
         read_pos += len;
     } else {
@@ -55,10 +55,9 @@ pub extern "C" fn buffer_updated(buffer: *mut c_char) {
             let mut s = String::with_capacity(len as usize);
             s.push_str(s1);
             s.push_str(s2);
-            client.post("http://localhost:3000/api/stacktraces")
+            _ = client.post("http://localhost:3000/api/stacktraces")
                 .body(s)
                 .send()
-                .unwrap();
         }
         read_pos = len - remaining;
     }