All Questions
18 questions
1
vote
1
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142
views
Why does writing a value larger than the buffer size of Java's PipedInputStream cause it to hang indefinitely?
This Scala code hangs indefinitely
import java.io._
import scala.io.Source
import scala.concurrent._
import scala.concurrent.ExecutionContext.Implicits.global
def copy(inputStream: InputStream, ...
- 1,368
1
vote
0
answers
76
views
Why is this use of piped IO streams in Scala hanging indefinitely? [duplicate]
I'm playing around with the stream interfaces discussed in this blog post. I've made what feels like a simple implementation to test out the interfaces, but it is hanging indefinitely when I run it ...
- 1,368
1
vote
1
answer
111
views
Java Process exec method won't let me pass input to a command
I'm practicing java.io methods, so I started by creating a script that prompts the user for a password and prints "correct" if the input is correct. Then, I wrote a java program that ...
- 13
1
vote
0
answers
64
views
Adding scanf makes processInputStream in Java disappear
I tried to run a C program inside Java one and Java one is supposed to get stdin/stadout of my C program. The moment I add scanf to C code, C doesn't seem to see Java's output.
When I make only ...
- 11
0
votes
2
answers
749
views
How to check whether a PrintStream is open without printing to it
I have a GUI program written in Java which outputs data to the command line using System.out.println. The data is intended to be piped into another program. As an example, I'll pipe the program ...
- 2,736
0
votes
1
answer
386
views
Java BufferedReader blocks on unix pipe
I am presently facing an issue while using BufferedReader to get an handle to a unix pipe. My java application first creates the pipe, then an external perl script executed through this java ...
- 459
1
vote
1
answer
179
views
Delegating error from writer thread of PipedWriter+PipedReader pair to the reader thread
What do I want?
I have a PipedWriter + PipedReader pair with two threads. I want, that the exception catched in the writer thread would be thrown on the next operation of the PipedReader wrapped into ...
- 9,816
-2
votes
2
answers
3k
views
How do you pipe the output of one file to input of another in Java?
Can someone show me code of something simple that pipes the output from one java file to the input of another in Java?
Say you have a file that is called hello.java that just simply outputs "hello". ...
- 329
1
vote
1
answer
445
views
Java I/O to pipe
For some reason this code only works when I close the output stream. How can I get it to work without having to close it?
I want to keep it open so I could keep sending data to the process without ...
- 559
0
votes
2
answers
647
views
Communication via standard input / output in Java
I am trying to send messages between two JVMs: a server starts a second process. The second process is then to send a message to the server which prints the message to the console. The code is as ...
- 57
0
votes
1
answer
148
views
Wrap linux filter in java
I want to write a JUnit test that assures that our self-implemented XML canonicalization works just like "xmllint --c14n".
ProcessBuilder pb = new ProcessBuilder("xmllint", "--c14n", "-");
...
- 3,016
3
votes
3
answers
4k
views
Java read a logfile live
I'm writing a cod4 server controller in Java(I know there are perfectly fine server controllers out there, but I want to learn from it). Now I want to take specific actions according to entries in a ...
- 4,064
4
votes
1
answer
4k
views
Wrapping a PipedInputStream with a BufferedInputStream
I have an OutputStream that I needed to read from, and so I used the following (Groovy) code to get an InputStream reference to the data:
PipedInputStream inputStream = new PipedInputStream()
...
- 312
7
votes
3
answers
10k
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How to copy input/output streams of the Process to their System counterparts?
This is a follow up to this question. The answer suggested there is
to copy the Process out, err, and input streams to the System versions
with IOUtils.copy as follows (after fixing various ...
- 56.2k
2
votes
2
answers
3k
views
Pipe data from InputStream to OutputStream in Java
I'd like to send a file contained in a ZIP archive unzipped to an external program for further decoding and to read the result back into Java.
ZipInputStream zis = new ZipInputStream(new ...
- 735