Add error handling

theseus/src/launcher/java.rs

@@ -1,21 +1,20 @@
+use crate::launcher::LauncherError;
 use lazy_static::lazy_static;
 use regex::Regex;
 use std::process::Command;
 
-#[derive(thiserror::Error, Debug)]
-pub enum JavaError {
-    #[error("System Error")]
-    SystemError(#[from] std::io::Error),
-}
-
 lazy_static! {
     static ref JAVA_VERSION_REGEX: Regex = Regex::new(r#""(.*?)""#).unwrap();
 }
 
-pub fn check_java() -> Result<Option<String>, JavaError> {
-    let child = Command::new("/usr/lib/jvm/java-8-openjdk/jre/bin/java")
+pub fn check_java() -> Result<Option<String>, LauncherError> {
+    let child = Command::new("java")
         .arg("-version")
-        .output()?;
+        .output()
+        .map_err(|err| LauncherError::ProcessError {
+            inner: err,
+            process: "java".to_string(),
+        })?;
 
     let output = &*String::from_utf8_lossy(&*child.stderr);