When I reformat code with Eclipse, it turns method headers like this:
public void myMethod(String param) {
into method headers like this:
public void myMethod(
String param) {
When I was brought on here I'd never used Eclipse before, and I imported project settings provided by someone else. I have seen that on small new projects I've worked on Eclipse does not do this, so it must be in the settings I've imported. But I've gone through every panel I can find, as well as every hidden file I can find in the workspace, and I can't figure out what is causing this.
How do I turn it off? I don't want a newline before parameters in my method signatures, and I can't imagine why anyone would!
Have a look at Window>Preferences>Java>Code Style>Formatter.
There you can configure almost everything. Your case is found at
Line Wrapping>Method Declarations>Parameters.