In case anyone had this problem I found the solution. It was simply a proxy problem and missing library problem.

1. add the rxJava ,okio and Okhttp jar lib.

2. This step is optional if u have a proxy problem like i did.

   String hostname = "10.84.10.11";
   int port = 3128;
   
   Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(hostname, port));
   OkHttpClient client = new OkHttpClient.Builder().proxy(proxy).build();
   
   String url = "https://rinkeby.infura.io/v3/c270b7df7bf54378a96ef7fe28e54715";
   
   web3 = Web3j.build(new HttpService(url, client, true));
   

In case anyone had this problem I found the solution. It was simply a proxy problem and missing library problem.

1. add the rxJava ,okio and Okhttp jar lib.

2. This step is optional if u have a proxy problem like i did.

   String hostname = "IP ADDRESS";
   int port = PORT;
   
   Proxy proxy = new Proxy(Proxy.Type.HTTP, new InetSocketAddress(hostname, port));
   OkHttpClient client = new OkHttpClient.Builder().proxy(proxy).build();
   
   String url = "https://rinkeby.infura.io/v3/<API-KEY>";
   
   web3 = Web3j.build(new HttpService(url, client, true));