Add dynamic value in spel expression

Question

I have a string with constant value and I want to pass it to rename_to header while using MV gateway.

I have tried below code snippet and one by adding the variable in context and then using it with #basePath

@Value("${basePath:/home/}")
String basePath;

.enrichHeaders(h -> h
                        .headerExpression(RENAME_TO, "'${basePath}' + headers[file_remoteFile]")
                        .headerExpression(REMOTE_FILE, "headers[file_remoteFile]")
                        .header(REMOTE_DIRECTORY, "headers[file_remoteDirectory]"))

I am getting error on startup. How can I give basePath in my application.properties

Answer 1

@Value("${basePath:/home/}")

String basePath;

Means "inject '/home/' into variable basePath if there is no basePath property.

You can't use fields from the enclosing class like that in the SPeL expression, and you can't use property placeholders in SpEL there; you have to concatenate the strings in the java.

.headerExpression(RENAME_TO, "'" + this.basePath + "'" + " + headers[file_remoteFile]")