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Accept server's self-signed ssl certificate in Java client
...and import it in your JVM truststore (to establish a chain of trust):
<JAVA_HOME>\bin\keytool -import -v -trustcacerts
-alias server-alias -file server.cer
-keystore cacerts.jks -keypass changeit
-storepass changeit
Option 2
Disable Certificate Validation:
// Create a trust manager that ...
Implementation difference between Aggregation and Composition in Java
...tion and Composition. Can someone tell me the implementation difference in Java between them with examples?
9 Answers
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How to convert String to Long in Kotlin?
...o number conversion.
public inline fun String.toLong(radix: Int): Long = java.lang.Long.parseLong(this, checkRadix(radix))
4. string.toLongOrNull(10)
Parses the string as a [Long] number and returns the result or null
if the string is not a valid representation of a number.
@throws I...
How to change JFrame icon [duplicate]
I have a JFrame that displays a Java icon on the title bar (left corner).
I want to change that icon to my custom icon. How should I do it?
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Is there a common Java utility to break a list into batches?
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Check out Lists.partition(java.util.List, int) from Google Guava:
Returns consecutive sublists of a list, each of the same size (the final list may be smaller). For example, partitioning a list containing [a, b, c, d, e] with a partition size of 3...
Parsing JSON array into java.util.List with Gson
...tring> and then parse the JSON array into that Type, like this:
import java.lang.reflect.Type;
import com.google.gson.reflect.TypeToken;
JsonElement yourJson = mapping.get("servers");
Type listType = new TypeToken<List<String>>() {}.getType();
List<String> yourList = new Gson...
What is the default initialization of an array in Java?
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Everything in a Java program not explicitly set to something by the programmer, is initialized to a zero value.
For references (anything that holds an object) that is null.
For int/short/byte/long that is a 0.
For float/double that is a ...
Is it OK to use == on enums in Java?
Is it OK to use == on enums in Java, or do I need to use .equals() ? In my testing, == always works, but I'm not sure if I'm guaranteed of that. In particular, there is no .clone() method on an enum, so I don't know if it is possible to get an enum for which .equals() would return a diffe...
Difference between the Apache HTTP Server and Apache Tomcat? [closed]
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Apache Tomcat is used to deploy your Java Servlets and JSPs. So in your Java project you can build your WAR (short for Web ARchive) file, and just drop it in the deploy directory in Tomcat.
So basically Apache is an HTTP Server, serving HTTP. Tomcat is a Servle...
Keystore type: which one to use?
By looking at the file java.security of my JRE , I see that the keystore type to use by default is set to JKS . Here , there is a list of the keystore types that can be used.
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