Task execution in different ways with Java

Task execution in different ways

Java 8 Parallel Stream Basic Usage & Perf. Test

Java 8 Consumer SAM sample

Java 8 stream samples not much but easily reachable

Generate FlameGraph for your java projects

1) Clone the lightweight-java-profiler: git clone https://github.com/dcapwell/lightweight-java-profiler.git

2) Go to it : cd lightweight-java-profiler/

3) Compile it: make all

4) Add this to the VM Options : -agentpath:/space/projects/lightweight-java-profiler/build-64/liblagent.so

5) Click Ok..Start the process...Send some requests.. close/terminate the application...traces.txt will be produced after terminating the project..See the below picture ..It is there..At the bottom..That file contains all cpu- measurements about the requests that you have sent (Actually not only the requests, everthing is recorded from the beginning of the time).

Now we need something to display this data..

It is the FlameGraph : https://github.com/brendangregg/FlameGraph

6) Get the FlameGraph : git clone https://github.com/brendangregg/FlameGraph.git

7) Execute the following command under the FlameGraph directory $: ./stackcollapse-ljp.awk < /pathToThe_traces_file/traces.txt | ./flamegraph.pl > traces.svg

8) Open the travces.svg with firefox

firefox travces.svg

9) Press Enter

10) bye

intellij show spring beans near line number

File > Project Structure > Facets >  Click the green + icon in the middle Panel > Select Spring

After Applying You will be seeing the Bean Definition Pointers as shown below

java CompletableFuture example

Unix sniff network traffic on specific port with tcpflow

Install it : sudo apt-get install tcpflow
Run the command on console : sudo tcpflow -i any -C -J port 1234


sunels@sunels:~$ sudo tcpflow -i any -C -J port 8888
tcpflow: listening on any




GET /hi?name=serkan, HTTP/1.1
Host: localhost:8888
Connection: keep-alive
Cache-Control: max-age=0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/48.0.2564.116 Chrome/48.0.2564.116 Safari/537.36
Accept-Encoding: gzip, deflate, sdch
Accept-Language: en-US,en;q=0.8


HTTP/1.1 200 OK
Server: Apache-Coyote/1.1
Content-Type: text/html;charset=UTF-8
Content-Length: 18
Date: Sat, 19 Mar 2016 20:22:39 GMT


Hi there, serkan,!