spring-projects / spring-projects/spring-tools
[exception from inside jdt ls] Cannot invoke "String.length()" because "typeSignature" is null
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@BoykoAlex is already working on this.
Since Oct 22, 2025.
for: eclipse
status: needs-validation
type: bug
- Dominant language
- Java
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Description
java.lang.NullPointerException: Cannot invoke "String.length()" because "typeSignature" is null
at org.eclipse.jdt.internal.compiler.parser.TypeConverter.createTypeReference(TypeConverter.java:129)
at org.eclipse.jdt.internal.core.BinaryTypeConverter.createTypeReference(BinaryTypeConverter.java:348)
at org.eclipse.jdt.internal.core.BinaryTypeConverter.convert(BinaryTypeConverter.java:200)
at org.eclipse.jdt.internal.core.BinaryTypeConverter.convert(BinaryTypeConverter.java:312)
at org.eclipse.jdt.internal.core.BinaryTypeConverter.buildTypeDeclaration(BinaryTypeConverter.java:99)
at org.eclipse.jdt.internal.codeassist.SelectionEngine.selectType(SelectionEngine.java:1591)
at org.eclipse.jdt.internal.core.NamedMember.resolveType(NamedMember.java:319)
at org.eclipse.jdt.internal.core.NamedMember.resolveType(NamedMember.java:261)
at org.springframework.tooling.jdt.ls.commons.java.JavaData.resolveFQName(JavaData.java:530)
at org.springframework.tooling.jdt.ls.commons.java.JavaData.fillTypeDescriptorData(J
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