Linux下WebLogic10.3用random device代替访问urandom导致启动缓慢挂起?
在Linux下启动Weblogic10.3时停在一个地方很久也没响应，好像死掉了，到底是什么原因呢？看一下thread dump：
java.lang.Thread.State: RUNNABLE
at java.io.FileInputStream.readBytes(Native Method)
at java.io.FileInputStream.read(FileInputStream.java:199)
at sun.security.provider.NativePRNG$RandomIO.readFully(NativePRNG.java:185)
at sun.security.provider.NativePRNG$RandomIO.implGenerateSeed(NativePRNG.java:202)
- locked <0xedab49d0> (a java.lang.Object)
at sun.security.provider.NativePRNG$RandomIO.access$300(NativePRNG.java:108)
at sun.security.provider.NativePRNG.engineGenerateSeed(NativePRNG.java:102)
at java.security.SecureRandom.generateSeed(SecureRandom.java:495)
at com.bea.security.utils.random.AbstractRandomData.ensureInittedAndSeeded(AbstractRandomData.java:83)
- locked <0xef612b88> (a com.bea.security.utils.random.SecureRandomData)
at com.bea.security.utils.random.AbstractRandomData.getRandomBytes(AbstractRandomData.java:97)
- locked <0xef612b88> (a com.bea.security.utils.random.SecureRandomData)
at com.bea.security.utils.random.AbstractRandomData.getRandomBytes(AbstractRandomData.java:92)
this problem is quite common on our linux blades. Looks like the urandom-Device stops responding or Jrockit is trying to access the random device instead of urandom.
Anyway, it can be fixed by:
a) patching <java.home>/jre/lib/security/java.security and replacing "securerandom.source=file:/dev/urandom" with "securerandom.source=file:/dev/./urandom"
b) or by starting your jvm with -Djava.security.egd=file:/dev/./urandom
c) added a symlink for /dev/random to point to /dev/urandom on your linux host