StringUtils.isBlank return false for null Strings

StringUtils.isBlank return false for null Strings

By : Nelson
Date : December 01 2020, 05:00 PM
it helps some times I also had this problem and found the trick just after saw the source code of String.valueof(). The source code of String.valueof() is below.
code :
public static String valueOf(Object obj) {
    return (obj == null) ? "null" : obj.toString();

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StringUtils.isBlank vs. Regexp

StringUtils.isBlank vs. Regexp

By : Jason Spontie
Date : March 29 2020, 07:55 AM
help you fix your problem Yes, StringUtils.isBlank(..) will do the same thing, and is a better way to go. Take a look at the code:
code :
public static boolean isBlank(String str) {
     int strLen;
     if ((str == null) || ((strLen = str.length()) == 0))
         return true;
     int strLen;
     for (int i = 0; i < strLen; ++i) {
        if (!(Character.isWhitespace(str.charAt(i)))) {
           return false;
   return true;
Differences between null and StringUtils.isBlank()

Differences between null and StringUtils.isBlank()

By : user3807122
Date : March 29 2020, 07:55 AM
Hope that helps If you expect any data that is not null to be a String then this.text.getData() != null might work but your code will later on have a class cast problem and the fact that the cast to String is not working shows a deeper problem.
If it is OK for 'data' to be some object of some type, then StringUtils is simply not the right solution and the Null-check is the right thing to do!
isBlank method to test string without space StringUtils.isBlank(" ") = false;

isBlank method to test string without space StringUtils.isBlank(" ") = false;

By : Hetang Shah
Date : March 29 2020, 07:55 AM
I wish this helpful for you The StringUtils class is from Apache Commons lang. The latest version is available from Maven Central. You can download it here.
why my StringUtils class doesn't have isBlank()

why my StringUtils class doesn't have isBlank()

By : user2568994
Date : March 29 2020, 07:55 AM
With these it helps The library you want to use is the org.apache.commons.lang.StringUtils and you have to add it to your classpath manually or add it as a dependency to your gradle configuration or any other build tool you are using.
IntelliJ does not know the library out of the box as it is not part of the JDK.
Apache's StringUtils.isBlank(str) vs. Guava's Strings.isNullOrEmpty(str): Should you routinely check for whitespace?

Apache's StringUtils.isBlank(str) vs. Guava's Strings.isNullOrEmpty(str): Should you routinely check for whitespace?

By : allusione
Date : March 29 2020, 07:55 AM
hope this fix your issue If you want to use Guava to replicate the isBlank behaviour, I would use the following method instead:
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