java cannot invoke because is null eclipse

stackoverflow.com › questions › 64001667 › cannot-invoke-because-is-null

I think your problem is related with the lack of a @Component annotation in your BoardDao class. The component should have a @Component annotation to instantiate the singleton to be injected in your Service Layer.

@Component
public class BoardDao extends SqlSessionDaoSupport{

    @Autowired
    SqlSessionTemplate session;

    public List<BoardDto> listboard(BoardDto dto) {
        System.out.println("dao.");
        List<BoardDto> result = session.selectList("boarddate.listboard", dto);
        return result;
    }

}

If the problem persist, you may try with the @Repository annotation. Sadly I haven't used the class SqlSessionDaoSupport, so I don't know exactly the best annotation for that.

Answer from Oscar Navarrete on Stack Overflow

GitHub

github.com › eclipse-pde › eclipse.pde › issues › 133

java.lang.NullPointerException: Cannot invoke "org.eclipse.pde.core.plugin.ModelEntry.getWorkspaceModels()" because "entry" is null · Issue #133 · eclipse-pde/eclipse.pde

May 31, 2022 - java.lang.NullPointerException: Cannot invoke "org.eclipse.pde.core.plugin.ModelEntry.getWorkspaceModels()" because "entry" is null at org.eclipse.pde.internal.launching.sourcelookup.PDESourceLookupDirector.getSourceContainers(PDESourceLookupDirector.java:99) at org.eclipse.pde.internal.launching.sourcelookup.PDESourceLookupQuery.getSourceContainers(PDESourceLookupQuery.java:321) at org.eclipse.pde.internal.launching.sourcelookup.PDESourceLookupQuery.getSourceElement(PDESourceLookupQuery.java:283) at org.eclipse.pde.internal.launching.sourcelookup.PDESourceLookupQuery.searchClasspathEntries(PD

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github.com › redhat-developer › intellij-quarkus › issues › 728

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bugs.eclipse.org › bugs › show_bug.cgi

581826 – java.lang.NullPointerException: Cannot invoke "String.isBlank()" because "webFacetVersionPropertyValue" is null

April 18, 2023 - Bugzilla – Bug 581826 java.lang.NullPointerException: Cannot invoke "String.isBlank()" because "webFacetVersionPropertyValue" is null Last modified: 2023-04-18 06:54:48 EDT

Stack Overflow

stackoverflow.com › questions › 64001667 › cannot-invoke-because-is-null

java - Cannot invoke "" because "" is null - Stack Overflow

Top answer

1 of 2

@Component
public class BoardDao extends SqlSessionDaoSupport{

    @Autowired
    SqlSessionTemplate session;

    public List<BoardDto> listboard(BoardDto dto) {
        System.out.println("dao.");
        List<BoardDto> result = session.selectList("boarddate.listboard", dto);
        return result;
    }

}

If the problem persist, you may try with the @Repository annotation. Sadly I haven't used the class SqlSessionDaoSupport, so I don't know exactly the best annotation for that.

2 of 2

In my case it was with a Map, I wanted to increase its value, but this initial one will not exist, therefore it is null.

map.put(0, map.get(0) 1);

It was fixed by adding a validation, like so:

map.put(0, map.get(0) != null ? map.get(0) + 1 : 1);

Eclipse

bugs.eclipse.org › bugs › show_bug.cgi

581595 – java.lang.NullPointerException: Cannot invoke "java.util.Collection.size()" because "this.cache" is null

February 27, 2023 - Bugzilla – Bug 581595 java.lang.NullPointerException: Cannot invoke "java.util.Collection.size()" because "this.cache" is null Last modified: 2023-02-27 09:36:26 EST

Code2care

code2care.org › home page › java › java exception with lambda cannot invoke becasue object is null

[Fix] Java Exception with Lambda - Cannot invoke because object is null | Code2care

September 4, 2022 - import java.util.ArrayList; import java.util.List; public class Example { public static void main(String[] args) { List<String> stringList = new ArrayList<>(); stringList.add("Java"); stringList.add("Example"); stringList.add("Text"); stringList.add(null); stringList.forEach(str -> { if(str == null) { System.out.println("NULL Value"); } else { System.out.println(str.substring(1)); } }); } } Java 8 Exception - cannot invoke because the object is null

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bugs.eclipse.org › bugs › show_bug.cgi

572979 – java.lang.NullPointerException: Cannot invoke "org.eclipse.jdt.internal.compiler.lookup.TypeBinding.needsUncheckedConversion(org.eclipse.jdt.internal.compiler.lookup.TypeBinding)" because "argumentType" is null

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Find elsewhere

Google Bing Mojeek

reddit.com › r/eclipse › java.lang.nullpointerexception: cannot invoke "java.sql.connection.createstatement()" because is null

r/eclipse on Reddit: java.lang.NullPointerException: Cannot invoke "java.sql.Connection.createStatement()" because is null

October 3, 2022 -

hello, im doing a list with SQL, and when i try to connect to the database, I always get this error, I already saw the ports, and everything is correct, but it says that it cannot connect, maybe a typing problem? can someone tell why what is wrong pls?

Top answer

1 of 1

The error speaks for itself, the connection is null, look at the stack traces of the previous exceptions.

GitHub

github.com › projectlombok › lombok › issues › 2788

[BUG] Eclipse: java.lang.NullPointerException: Cannot invoke "org.eclipse.jdt.internal.compiler.CompilationResult.getCompilationUnit()" because "unitResult" is null · Issue #2788 · projectlombok/lombok

March 24, 2021 - [BUG] Eclipse: java.lang.NullPointerException: Cannot invoke "org.eclipse.jdt.internal.compiler.CompilationResult.getCompilationUnit()" because "unitResult" is null#2788

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forums.garmin.com › developer › connect-iq › f › discussion › 274440 › build-error-cannot-invoke-java-util-map-get-object-because-strings-is-null

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OneUptime

oneuptime.com › home › blog › how to handle 'cannot invoke method on null' errors

How to Handle 'Cannot invoke method on null' Errors

December 22, 2025 - Use Optional for values that might not exist, validate inputs at boundaries, use constructor injection with required dependencies, and return empty collections instead of null. Modern Java's helpful NPE messages make debugging easier, but prevention is better than cure.

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stackoverflow.com › questions › 79128692 › java-lang-nullpointerexception-cannot-invoke-because-the-return-value-of-is-nul › 79128696

spring boot - java.lang.NullPointerException: Cannot invoke because the return value of is null - Stack Overflow

Top answer

1 of 1

Replace Optional.of(profile.getTitle().name()).orElse(null) with Optional.ofNullable(profile.getTitle()).map(x->x.name()).orElse(null)

JetBrains

youtrack.jetbrains.com › issue › IDEA-297028

Jetbrains

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reddit.com › r/javahelp › exception in thread "main" java.lang.nullpointerexception: cannot invoke "java.net.url.toexternalform()" because "location" is null

r/javahelp on Reddit: Exception in thread "main" java.lang.NullPointerException: Cannot invoke "java.net.URL.toExternalForm()" because "location" is null

May 18, 2023 -

https://pastebin.com/vtcMwSRn

So I am currently going crazy trying to get images to load when you export it to a .jar file. Before I was just using, "new imageicon("picturepath")"

As you can see from lines 30-34.

Then I found out that doesn't carry over when you make the project into a .jar file, okay cool. So I found out that you want to use, "getResource" okay cool got it. Try that and now I get the error in the title. when that location isn't fucking null so that's horse shit. I've tried every variation of that path. I have tried moving my images folder all over the project; from inside the src folder, where it is now, to just in the main project folder, etc. I don't know why it isn't happy.

Exception in thread "main" java.lang.NullPointerException: Cannot invoke 
"java.net.URL.toExternalForm()" because "location" is null
at java.desktop/javax.swing.ImageIcon.<init>(ImageIcon.java:234)
at LaunchPage.<init>(LaunchPage.java:25)
at Main.main(Main.java:5)

Top answer

1 of 2

When you use getResource() (on a class or a classloader) the file is assumed to be located on the classpath, paths may be relative or absolute, but on the classpath. For example, MyClass.getClass().getResource("myfile"), will look for myfile in the same packege as MyClass (the file are assumed to be located in the same folder as "MyClass.class" when the program runs). You may read more about it at: https://www.baeldung.com/java-class-vs-classloader-getresource https://docs.oracle.com/javase/8/docs/technotes/guides/lang/resources.html (it is old, but still relevant)

2 of 2

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codespeedy.com › home › reasons and solutions of null pointer exception in java

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October 11, 2021 - Exception in thread "main" java.lang.NullPointerException: Cannot throw exception because "null" is null at example5.main(example5.java:4)