How to enter the path of file on unix using Java

Question

I am trying to pass a file to JSON parser on the unix box like this:

JSONArray a = (JSONArray) parser.parse("/opt/Scheherazade/hegrid.git/hegrid-web/EventsJson.json");

This will run on the unix box. But I get the following error :

Unexpected character (/) at position 0. at org.json.simple.parser.Yylex.yylex(Unknown Source) at org.json.simple.parser.JSONParser.nextToken(Unknown Source) at org.json.simple.parser.JSONParser.parse(Unknown Source) at org.json.simple.parser.JSONParser.parse(Unknown Source) at org.json.simple.parser.JSONParser.parse(Unknown Source) at com.ca.service.ModifyEventJsonFile.replaceActorJsonFile(ModifyEventJsonFile.java:21) at com.ca.controller.ChefController.saveSchzScript(ChefController.java:139) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:497)

How to enter the path correctly?

I suspect that parse.parse(String) assumes that the String is a JSON String, not a file reference, try parser.parse(new File("/opt/Scheherazade/hegrid.git/hegrid-web/EventsJson.json")); instead — MadProgrammer
– MadProgrammer, Commented Jul 6, 2015 at 7:05
I cannot use parser.parse(new File("/opt/Scheherazade/hegrid.git/hegrid-web/EventsJson.json")). parser.parse accepts a string so I have to make it as " parser.parse(String.valueOf(new File("/opt/Scheherazade/hegrid.git/hegrid-web/EventsJson.json")));" — user3615059
– user3615059, Commented Jul 6, 2015 at 7:07
No, sorry, you're required to provide Reader, had to dig the source out... — MadProgrammer
– MadProgrammer, Commented Jul 6, 2015 at 7:10

MadProgrammer · Accepted Answer · 2015-07-06 07:10:13Z

2

Based on the examples found here and the source code, JSONParser#parse(String) expects the String value to be a JSON String and not a file reference.

The only only other method available is JSONParser#parse(Reader), something like

try (FileReader reader = new FileReader(new File("/opt/Scheherazade/hegrid.git/hegrid-web/EventsJson.json"))) {
    JSONArray a = (JSONArray)parser.parse(reader);
}

should get a little closer to your goal

answered Jul 6, 2015 at 7:10

MadProgrammer

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