java - Thread hangs while executing DNS query employing JNDI library -

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below deadlock encountered result of thread getting locked while fetching txt record dns 

java.lang.thread.state: runnable     @ java.io.fileinputstream.readbytes(native method)     @ java.io.fileinputstream.read(fileinputstream.java:272)     @ sun.security.provider.nativeprng$randomio.readfully(nativeprng.java:202)     @ sun.security.provider.nativeprng$randomio.ensurebuffervalid(nativeprng.java:264)     @ sun.security.provider.nativeprng$randomio.implnextbytes(nativeprng.java:278)     - locked <0x00000004f3cd17b0> (a java.lang.object)     @ sun.security.provider.nativeprng$randomio.access$200(nativeprng.java:125)     @ sun.security.provider.nativeprng.enginenextbytes(nativeprng.java:114)     @ java.security.securerandom.nextbytes(securerandom.java:466)     - locked <0x00000004f111d290> (a java.security.securerandom)     @ java.security.securerandom.next(securerandom.java:488)     @ java.util.random.nextint(random.java:303)     @ com.sun.jndi.dns.dnsclient.query(dnsclient.java:175)     @ com.sun.jndi.dns.resolver.query(resolver.java:81)     @ com.sun.jndi.dns.dnscontext.c_getattributes(dnscontext.java:430)     @ com.sun.jndi.toolkit.ctx.componentdircontext.p_getattributes(componentdircontext.java:231)     @ com.sun.jndi.toolkit.ctx.partialcompositedircontext.getattributes(partialcompositedircontext.java:139)     @ com.sun.jndi.toolkit.ctx.partialcompositedircontext.getattributes(partialcompositedircontext.java:127)     @ javax.naming.directory.initialdircontext.getattributes(initialdircontext.java:142)

on analysing, find thread lock due slowness in executing java.security.securerandom.next .

below jdk bug filed similar deadlock encountered https://bugs.openjdk.java.net/browse/jdk-8066209

can please let me know reason occurring & how resolved ?

i seeing same issue , believe i've solved it. problem appears securerandom.nextbytes reads /dev/random. however, if there isn't sufficent entropy left in /dev/random entropy pool read block. possible solutions see the oracle docs issue, this excellent article options securerandom, , this bug setting java option use /dev/./urandom rather seemingly equivalent /dev/urandom


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