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Get IP of a specific host is not working over a network with Java

I'm not able to get IP of hostname over a network.
I can get public IP but seems not to work over a network because of missing protocol:
public static void main(String[] args) throws UnknownHostException {
String url = "host22.my.network";
getIp(url);
}
public static void getIp(String url) throws UnknownHostException{
try {
InetAddress ip = InetAddress.getByName(new URL(url).getHost());
System.err.println(ip);
}
catch (MalformedURLException e) {
System.err.println(e.getMessage());
}
}
maybe it's missing a protocol prefix

Since #ejp doesn't want to actually answer questions any more, here's what he's saying:
new URL(url).getHost() is wrong. Instead, use
InetAddress ip = InetAddress.getByName(url)
And since you're not actually passing a URL, rename the parameter to hostname.

Test an Oracle DB connection in Java, with no username/password

I know this is very similar to questions already answered, but there is a slight variation.
I have a list of connections in my production connection setup. The process is to start with the first and keep trying till I get a connection. I would like to be able to run a task that used this same list as its input, but did just enough to show which of the connections will be used by the application. To avoid our security team getting all upset, this would have to be done without the username/password.
Is it possible?

Below answer may be helpful to you. getErrorCode() method in SQLException returns 1017 value on authentication failure. So you can iterate through list of connections and invoke validateConnection.
I'm using dummy username and password here (I don't see any other option)
Replace host, port and SID values.
public static void main(String[] args) {
String connString = "jdbc:oracle:thin:#host:port:SID";
System.out.println(validateConnection(connString));
}
public static boolean validateConnection(String connString) {
try {
Class.forName("oracle.jdbc.driver.OracleDriver");
Connection con = DriverManager.getConnection(connString, "x", "y");
} catch (SQLException sqle) {
if (sqle.getErrorCode() == 1017)
return true;
} catch (Exception e) {
e.printStackTrace();
}
return false;
}

Invoking a worklight adaptor from a stand alone java program

I can invoke the worklight adaptor procedure in my machine by using the below URL.
http://192.168.1.101:10080/AdaptorUI/dev/invoke?adapter=MySQLAdaptor&procedure=procedure1&parameters=[]
Now, i want to invoke this from a java program.
Code goes like this,
try {
URL myURL = new URL("http://192.168.1.101:10080/AdaptorUI /dev/invoke?adapter=MySQLAdaptor&procedure=procedure1&parameters=[]");
URLConnection myURLConnection = myURL.openConnection();
myURLConnection.connect();
}
catch (MalformedURLException e) {
// new URL() failed
// ...
System.out.println("Inside the MalformedURLException");
}
catch (IOException e) {
// openConnection() failed
// ...
System.out.println("IOException");
}
Somehow the above program is not working. Can you pls help ?

First, you should probably remove the /dev from the URL; /dev should be used only in a development environment.
Second, I suggest looking at the solution provided to this question: Java URL doesn't seem to connect, but no exception thrown
From the comments: Missing line of code:
BufferedReader in = new BufferedReader(new InputStreamReader(myURLConnection.getInputStream()));

How to check if URL is blocked by my firewall

I am trying to check if the URL is accessible or not. I am using HttpURLConnection for it. This is now I am implementing it.
public static boolean isUrlAccessible(final String urlToValidate)
throws WAGException {
URL url = null;
HttpURLConnection huc = null;
int responseCode = -1;
try {
url = new URL(urlToValidate);
huc = (HttpURLConnection) url.openConnection();
huc.setRequestMethod("HEAD");
huc.connect();
responseCode = huc.getResponseCode();
} catch (final UnknownHostException e) {
e.printStackTrace();
System.out.println(e.getMessage()+" "+e.getLocalizedMessage());
return false;
} catch (final MalformedURLException e){
e.printStackTrace();
System.out.println(e.getMessage()+" "+e.getLocalizedMessage());
return false;
} catch (ProtocolException e) {
e.printStackTrace();
System.out.println(e.getMessage()+" "+e.getLocalizedMessage());
return false;
} catch (IOException e) {
e.printStackTrace();
System.out.println(e.getMessage()+" "+e.getLocalizedMessage());
return false;
} finally {
if (huc != null) {
huc.disconnect();
}
}
return responseCode == 200;
}
When the Internet is down it throws an UnknownHostException, I wanted to know how do I check if a fire wall is blocking a URL and thats why I get an exception and not because that the URL is not accessible. Also, I am just checking for response code 200 to make sure that the URL is accessible. Are there any other checks I need to perform?

When the Internet is down it throws an UnknownHostException
No, it throws that when the DNS is down or the host isn't known to DNS.
I wanted to know how do I check if a fire wall is blocking a URL
You will get a connect timeout. In rare cases with obsolete hardware you may get a connection refusal, but I haven't heard of that this century. But you will also get a connect timeout if the host is down.
I am just checking for response code 200 to make sure that the URL is accessible. Are there any other checks I need to perform?
No. But URLs aren't blocked by firewalls. Ports are blocked by firewalls.

The exception I have usually seen when a firewall is blocking the connection is "java.net.NoRouteToHostException". Try catching that and see if it helps.

As others have said, the answer is "it depends".
Our perimeter firewall for example does a redirect, because we want to show the user a custom screen.
In this case, I would try to look into the HTTP Status code (30x).
I think it's hard to write a generic function for something like this, you need to tailor this to your setting or make it very configurable.
Just make sure to remain as generic as possible.
If your code for example assumes a redirect to a specific URL, this will beak once the infrastructure changes (which happens more often than anticipated).

How to create a "FTPS" Mock Server to unit test File Transfer in Java

I have a CreateFTPConnection class which create a FTPS connection. Using this connection, files are transferred. Here is the code of TransferFile class
public class TransferFile
{
private CreateFTPConnection ftpConnection;
private FTPSClient client;
public TransferFile(CreateFTPConnection ftpConnection) {
this.ftpConnection = ftpConnection;
this.client = ftpConnection.getClient();
}
public void transfer(Message<?> msg)
{
InputStream inputStream = null;
try
{
if(!client.isConnected()){
ftpConnection.init();
client = ftpConnection.getClient();
}
File file = (File) msg.getPayload();
inputStream = new FileInputStream(file);
client.storeFile(file.getName(), inputStream);
client.sendNoOp();
} catch (Exception e) {
try
{
client.disconnect();
}
catch (IOException e1) {
e1.printStackTrace();
}
}
finally
{
try {
inputStream.close();
}
catch (IOException e) {
e.printStackTrace();
}
}
}
}
I have to write jUnit Testcase for this class. For this, I have to create a FTPS Mock Server connection and have to use that connection to test the File Transfer. So can anyone plz give me any idea of how to make FTPS Mock Server and do the test case. I googled on this, but what I get is on FTP or SFTP, not FTPS. Please help me.

You might find this useful MockFTPServer
The issue is that these mock servers don't implement the TLS portion from what I can see. You may need to do a little work to allow connections via TLS.
You should be able to search around and find some articles here on SO about dealing with certificates, (or in some cases, bypassing them) for the sake of your testing.
Here's another Article that goes through the steps of creating a basic FTP server Test.
Short of a full blown FTP server (Apache http w/ mod_ftp add on), there doesn't seem to be anything useful to do this.