I am debugging an issue with my local Fiji/ImageJ installation failing to update through the Help -> Update UI. The ImageJ code that triggers the issue is this updater code: https://github.com/imagej/imagej-ui-swing/blob/78a3180b6bc830166d15c73a01443c7a642c3908/src/main/java/net/imagej/ui/swing/updater/ImageJUpdater.java#L360-L370
I wrote minimal test case to reproduce this pointing JAVA_HOME at the Fiji/ImageJ application (/Applications/Fiji.app/java/macosx/zulu8.60.0.21-ca-fx-jdk8.0.322-macosx_x64/jre/Contents/Home).
import java.net.URL;
import java.net.URLClassLoader;
import java.net.URLConnection;
import java.io.IOException;
import java.net.HttpURLConnection;
class HelloWorld {
public static void main(String[] args) {
try {
final URL url = new URL("http://neverssl.com");
final URLConnection urlConn = url.openConnection();
final HttpURLConnection httpConn = (HttpURLConnection) urlConn;
final int code = httpConn.getResponseCode();
} catch (IOException ioe) {
ioe.printStackTrace();
}
}
}
This code results in the following error:
java.io.IOException: Error writing to server
at sun.net.www.protocol.http.HttpURLConnection.writeRequests(HttpURLConnection.java:705)
at sun.net.www.protocol.http.HttpURLConnection.writeRequests(HttpURLConnection.java:717)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1598)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1505)
at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
at HelloWorld.main(HelloWorld.java:14)
If I change the URL to an https URL, the error changes to
javax.net.ssl.SSLException: Couldn't kickstart handshaking
at sun.security.ssl.Alert.createSSLException(Alert.java:127)
at sun.security.ssl.TransportContext.fatal(TransportContext.java:348)
at sun.security.ssl.TransportContext.fatal(TransportContext.java:291)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:449)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:410)
at sun.net.www.protocol.https.HttpsClient.afterConnect(HttpsClient.java:559)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:197)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1577)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1505)
at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java:480)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(HttpsURLConnectionImpl.java:352)
at HelloWorld.main(HelloWorld.java:14)
Suppressed: java.net.SocketException: Broken pipe (Write failed)
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:111)
at java.net.SocketOutputStream.write(SocketOutputStream.java:155)
at sun.security.ssl.SSLSocketOutputRecord.encodeAlert(SSLSocketOutputRecord.java:81)
at sun.security.ssl.TransportContext.fatal(TransportContext.java:379)
... 10 more
Caused by: java.net.SocketException: Broken pipe (Write failed)
at java.net.SocketOutputStream.socketWrite0(Native Method)
at java.net.SocketOutputStream.socketWrite(SocketOutputStream.java:111)
at java.net.SocketOutputStream.write(SocketOutputStream.java:155)
at sun.security.ssl.SSLSocketOutputRecord.flush(SSLSocketOutputRecord.java:251)
at sun.security.ssl.HandshakeOutStream.flush(HandshakeOutStream.java:89)
at sun.security.ssl.ClientHello$ClientHelloKickstartProducer.produce(ClientHello.java:580)
at sun.security.ssl.SSLHandshake.kickstart(SSLHandshake.java:510)
at sun.security.ssl.ClientHandshakeContext.kickstart(ClientHandshakeContext.java:112)
at sun.security.ssl.TransportContext.kickstart(TransportContext.java:231)
at sun.security.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:432)
... 8 more
Comparing a tcpdump filtered on the attempted host on this machine compared to a working one, I see early FIN packets being sent before any PSH packets are sent, so I think that is related to connections closing early.
On another machine running the same OS X version, I ran the same snippet pointing JAVA_HOME at the same directory, and had no issues.
Related
Good evening,
I have been facing this error for a couple of days by now, and despite looking for a solution all over the web, I coul'd fix this error.
import java.util.Hashtable;
import javax.naming.Context;
import javax.naming.NamingEnumeration;
import javax.naming.directory.Attribute;
import javax.naming.directory.Attributes;
import javax.naming.directory.BasicAttribute;
import javax.naming.directory.BasicAttributes;
import javax.naming.directory.DirContext;
import javax.naming.directory.InitialDirContext;
public class LDAPtest {
public static void main(String[] args) {
try {
String keystorePath = "C:/Program Files/Java/jdk-13.0.2/lib/security/cacerts";
System.setProperty("javax.net.ssl.keyStore", keystorePath);
System.setProperty("javax.net.ssl.keyStorePassword", "changeit");
Hashtable<String, String> ldapEnv = new Hashtable<>();
ldapEnv.put(Context.INITIAL_CONTEXT_FACTORY,"com.sun.jndi.ldap.LdapCtxFactory");
ldapEnv.put(Context.PROVIDER_URL, "ldaps://localhost:10636");
ldapEnv.put(Context.SECURITY_AUTHENTICATION,"simple");
ldapEnv.put(Context.SECURITY_PRINCIPAL,"uid=admin,ou=system");
ldapEnv.put(Context.SECURITY_CREDENTIALS,"secret");
DirContext connection = new InitialDirContext(ldapEnv);
System.out.println("Benvenuto " + connection);
NamingEnumeration enm = connection.list("");
while (enm.hasMore()) {
System.out.println(enm.next());
}
enm.close();
connection.close();
}catch(Exception e) {
e.printStackTrace();
}
}
}
This code is actually working when SSL is not tested, replacing the
ldapEnv.put(Context.PROVIDER_URL, "ldaps://localhost:10636");
with
ldapEnv.put(Context.PROVIDER_URL, "ldap://localhost:10389");
I made the setup for the LDAP server with Apache Directory Studio, and followed this tutorial here in order to get the LDAPS to work:
http://directory.apache.org/apacheds/basic-ug/3.3-enabling-ssl.html
So I made the certificate, even installed it and imported it with keytool into cacerts.
I enabled portforwarding for the chosen port (10636), but still, I'm getting this exception:
javax.naming.CommunicationException: simple bind failed: localhost:10636 [Root exception is
java.net.SocketException: Connection or outbound has closed]
at java.naming/com.sun.jndi.ldap.LdapClient.authenticate(LdapClient.java:219)
at java.naming/com.sun.jndi.ldap.LdapCtx.connect(LdapCtx.java:2795)
at java.naming/com.sun.jndi.ldap.LdapCtx.<init>(LdapCtx.java:320)
at java.naming/com.sun.jndi.ldap.LdapCtxFactory.getLdapCtxFromUrl(LdapCtxFactory.java:225)
at java.naming/com.sun.jndi.ldap.LdapCtxFactory.getUsingURL(LdapCtxFactory.java:189)
at java.naming/com.sun.jndi.ldap.LdapCtxFactory.getUsingURLs(LdapCtxFactory.java:243)
at java.naming/com.sun.jndi.ldap.LdapCtxFactory.getLdapCtxInstance(LdapCtxFactory.java:154)
at java.naming/com.sun.jndi.ldap.LdapCtxFactory.getInitialContext(LdapCtxFactory.java:84)
at java.naming/javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:730)
at java.naming/javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:305)
at java.naming/javax.naming.InitialContext.init(InitialContext.java:236)
at java.naming/javax.naming.InitialContext.<init>(InitialContext.java:208)
at java.naming/javax.naming.directory.InitialDirContext.<init>(InitialDirContext.java:130)
at Prova3.main(Prova3.java:31)
Caused by: java.net.SocketException: Connection or outbound has closed
at java.base/sun.security.ssl.SSLSocketImpl$AppOutputStream.write(SSLSocketImpl.java:1246)
at java.base/java.io.BufferedOutputStream.flushBuffer(BufferedOutputStream.java:81)
at java.base/java.io.BufferedOutputStream.flush(BufferedOutputStream.java:142)
at java.naming/com.sun.jndi.ldap.Connection.writeRequest(Connection.java:398)
at java.naming/com.sun.jndi.ldap.Connection.writeRequest(Connection.java:371)
at java.naming/com.sun.jndi.ldap.LdapClient.ldapBind(LdapClient.java:359)
at java.naming/com.sun.jndi.ldap.LdapClient.authenticate(LdapClient.java:214)
... 13 more
Thank you in advance
For Googlers:
simple bind failed errors are almost always related to SSL connection.
With nc or telnet, check whether a connection can be established between client and remote host and port.
With SSLPoke.java (a simple Java class to check SSL connection), check whether certificates are correctly imported and used, also check correct TLS version. Use something like java -Dhttps.protocols=TLSv1,TLSv1.1,TLSv1.2 -Djavax.net.debug=all SSLPoke google.com 443 > log.txt 2>&1.
Look for:
Warning: no suitable certificate found - continuing without client authentication = check whether you have set javax.net.ssl.trustStore
Fatal (HANDSHAKE_FAILURE): Couldn't kickstart handshaking = could be mismatched TLS versions
Also check whether your intermediate CA is expired
Kind Attn Moderators: Before marking this query as duplicate, please note I have checked these questions...
java.net.SocketException: Connection reset
What's causing my java.net.SocketException: Connection reset?
Getting error "java.net.SocketException: Connection reset"
...and was unable to fix the issue. Also I believe the context & error is different from those, thus seeking help here.
Context: Download a csv file from NSEIndia website to a local folder (Note: Am able to download CSV files from other random websites).
Issue: Returns an error - javax.net.ssl.SSLException: Connection reset (Full error pasted below)
Observation: I am perplexed, as I faced this same issue yesterday, but after a couple of retries, it worked. I made no changes to code or settings.
Question: Is there anything I can do from my end to ensure this error is not seen with this specific website ?
Code:
// Using FileUtils from -> import org.apache.commons.io.FileUtils;
try {
FileUtils.copyURLToFile(new URL("https://www.nseindia.com/content/fo/fo_mktlots.csv"),new File("D:\\Download\\t1.csv"));
} catch (IOException e) {
e.printStackTrace();
}
Error:
javax.net.ssl.SSLException: Connection reset
at java.base/sun.security.ssl.Alert.createSSLException(Alert.java:127)
at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:324)
at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:267)
at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:262)
at java.base/sun.security.ssl.SSLSocketImpl.handleException(SSLSocketImpl.java:1652)
at java.base/sun.security.ssl.SSLSocketImpl$AppInputStream.read(SSLSocketImpl.java:1038)
at java.base/java.io.BufferedInputStream.fill(BufferedInputStream.java:245)
at java.base/java.io.BufferedInputStream.read1(BufferedInputStream.java:285)
at java.base/java.io.BufferedInputStream.read(BufferedInputStream.java:344)
at java.base/sun.net.www.http.HttpClient.parseHTTPHeader(HttpClient.java:746)
at java.base/sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:689)
at java.base/sun.net.www.http.HttpClient.parseHTTP(HttpClient.java:717)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream0(HttpURLConnection.java:1610)
at java.base/sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1515)
at java.base/sun.net.www.protocol.https.HttpsURLConnectionImpl.getInputStream(HttpsURLConnectionImpl.java:224)
at java.base/java.net.URL.openStream(URL.java:1162)
at org.apache.commons.io.FileUtils.copyURLToFile(FileUtils.java:1456)
at main.Test.dummy3(Test.java:327)
at main.Test.main(Test.java:59)
Suppressed: java.net.SocketException: Connection reset by peer
at java.base/sun.nio.ch.NioSocketImpl.implWrite(NioSocketImpl.java:421)
at java.base/sun.nio.ch.NioSocketImpl.write(NioSocketImpl.java:441)
at java.base/sun.nio.ch.NioSocketImpl$2.write(NioSocketImpl.java:825)
at java.base/java.net.Socket$SocketOutputStream.write(Socket.java:1007)
at java.base/sun.security.ssl.SSLSocketOutputRecord.encodeAlert(SSLSocketOutputRecord.java:82)
at java.base/sun.security.ssl.TransportContext.fatal(TransportContext.java:355)
... 17 more
Caused by: java.net.SocketException: Connection reset
at java.base/sun.nio.ch.NioSocketImpl.implRead(NioSocketImpl.java:324)
at java.base/sun.nio.ch.NioSocketImpl.read(NioSocketImpl.java:351)
at java.base/sun.nio.ch.NioSocketImpl$1.read(NioSocketImpl.java:802)
at java.base/java.net.Socket$SocketInputStream.read(Socket.java:937)
at java.base/sun.security.ssl.SSLSocketInputRecord.read(SSLSocketInputRecord.java:450)
at java.base/sun.security.ssl.SSLSocketInputRecord.bytesInCompletePacket(SSLSocketInputRecord.java:68)
at java.base/sun.security.ssl.SSLSocketImpl.readApplicationRecord(SSLSocketImpl.java:1409)
at java.base/sun.security.ssl.SSLSocketImpl$AppInputStream.read(SSLSocketImpl.java:1022)
... 13 more
This question already has answers here:
What is a connection timeout during a http request
(2 answers)
Closed 27 days ago.
I get an exception when I run this code. Why?
Exception in thread "main" java.net.ConnectException: Connection timed out: connect
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
public class MainClass {
public static void main(String[] args) throws Exception {
System.setProperty("java.protocol.handler.pkgs", "com.sun.net.ssl.internal.www.protocol");
URL url = new URL("https://www.verisign.com/");
BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
String line;
while ((line = in.readLine()) != null) {
System.out.println(line);
}
in.close();
}
}
Exception:
Exception in thread "main" java.net.ConnectException: Connection timed out: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:525)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:550)
at com.sun.net.ssl.internal.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:141)
at sun.net.NetworkClient.doConnect(NetworkClient.java:163)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:394)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)
at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:272)
at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:329)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:172)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:801)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:158)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1049)
at com.sun.net.ssl.internal.www.protocol.https.HttpsURLConnectionOldImpl.getInputStream(HttpsURLConnectionOldImpl.java:204)
at java.net.URL.openStream(URL.java:1010)
at https.ssl.MainClass.main(MainClass.java:13)
We can't diagnose your networks for you. You need to do it yourself, or get your local admins to look at.
Things you should check before you bug your admins:
can you ping the host?
can you connect to http://www.verisign.com using a web browser?
can you connect to https://www.verisign.com using a web browser?
can you connect to http://www.verisign.com using your program?
can you connect to anything using your program?
The chances are that your problem is firewall related. My first guess would be that you don't have the correct environment variables or Java system properties set to tell the JVM to use a local proxy server for outgoing HTTP / HTTPS requests.
If it is not a problem with your settings, you will need to get help from someone local who can help you diagnose the problem.
I've tried to used RMI, here is server side. at first it worked without any exception, but now after three times whenever i try to run the below code, i will get some errors
The code is:
import java.rmi.server.UnicastRemoteObject;
/**
* Created by elyas on 12/11/14 AD.
*/
public class LogicImplement extends UnicastRemoteObject implements Logic
{
public LogicImplement() throws Exception
{
java.rmi.registry.LocateRegistry.createRegistry(6060);
java.rmi.Naming.rebind("Object1",this);
}
#Override
public int sum(int a, int b) throws Exception
{
int result = a + b;
System.out.println("ana sum executed");
return result;
}
public static void main(String[] args)
{
try
{
LogicImplement logicImplement = new LogicImplement();
} catch (Exception e)
{
e.printStackTrace();
}
}
}
The error is like this: i've tried to change the Object1 to for example Object2, but again i will get error, also i change the port number...
what is solution?
java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested exception is:
java.net.ConnectException: Connection refused
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:619)
at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:216)
at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:202)
at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:341)
at sun.rmi.registry.RegistryImpl_Stub.rebind(Unknown Source)
at java.rmi.Naming.rebind(Naming.java:177)
at LogicImplement.<init>(LogicImplement.java:12)
at LogicImplement.main(LogicImplement.java:27)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
at java.net.Socket.connect(Socket.java:579)
at java.net.Socket.connect(Socket.java:528)
at java.net.Socket.<init>(Socket.java:425)
at java.net.Socket.<init>(Socket.java:208)
at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:40)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:147)
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:613)
... 12 more
java.net.ConnectException: Connection refused
There could be couple of reasons for this exception:
You have not started your rmiregistry in background.
You are trying to connect to the wrong port number.
Your firewall maybe blocking the connections.
The Answer was very simple, By default, the registry runs on port 1099. To start the registry on a different port, specify the port number on the command line. Do not forget to unset your CLASSPATH environment variable. for more information check this link: Running the Example Programs
** So for fixing this code i must change the port number form 6060 to 1099
notice that: if 1099 is used by other services you have to test 1100, and if 1100 is used too, you have yo use 1101 and so on. :-)
Since this was a port number issue, there is another way to start the registry on the port number you want:
java.rmi.registry.Registry rmiRegistry = java.rmi.registry.LocateRegistry.
createRegistry(6060); // Creates a registry on 6060
rmiRegistry.rebind("Object1",this); // Binds to registry created on 6060
You haven't started the RMI Registry.
When you get past this, if it still happens when calling the remote method, see item A.1 of the RMI FAQ.
This question already has answers here:
What is a connection timeout during a http request
(2 answers)
Closed last month.
I get an exception when I run this code. Why?
Exception in thread "main" java.net.ConnectException: Connection timed out: connect
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.net.URL;
public class MainClass {
public static void main(String[] args) throws Exception {
System.setProperty("java.protocol.handler.pkgs", "com.sun.net.ssl.internal.www.protocol");
URL url = new URL("https://www.verisign.com/");
BufferedReader in = new BufferedReader(new InputStreamReader(url.openStream()));
String line;
while ((line = in.readLine()) != null) {
System.out.println(line);
}
in.close();
}
}
Exception:
Exception in thread "main" java.net.ConnectException: Connection timed out: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:195)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
at java.net.Socket.connect(Socket.java:525)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.connect(SSLSocketImpl.java:550)
at com.sun.net.ssl.internal.ssl.BaseSSLSocketImpl.connect(BaseSSLSocketImpl.java:141)
at sun.net.NetworkClient.doConnect(NetworkClient.java:163)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:394)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)
at sun.net.www.protocol.https.HttpsClient.<init>(HttpsClient.java:272)
at sun.net.www.protocol.https.HttpsClient.New(HttpsClient.java:329)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(AbstractDelegateHttpsURLConnection.java:172)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:801)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(AbstractDelegateHttpsURLConnection.java:158)
at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection.java:1049)
at com.sun.net.ssl.internal.www.protocol.https.HttpsURLConnectionOldImpl.getInputStream(HttpsURLConnectionOldImpl.java:204)
at java.net.URL.openStream(URL.java:1010)
at https.ssl.MainClass.main(MainClass.java:13)
We can't diagnose your networks for you. You need to do it yourself, or get your local admins to look at.
Things you should check before you bug your admins:
can you ping the host?
can you connect to http://www.verisign.com using a web browser?
can you connect to https://www.verisign.com using a web browser?
can you connect to http://www.verisign.com using your program?
can you connect to anything using your program?
The chances are that your problem is firewall related. My first guess would be that you don't have the correct environment variables or Java system properties set to tell the JVM to use a local proxy server for outgoing HTTP / HTTPS requests.
If it is not a problem with your settings, you will need to get help from someone local who can help you diagnose the problem.