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<p style="margin: 10px 0 0 0">I can reproduce with this code (The problem is when the datasource is MysqlDataSource not when datasource is <br /> hsqldb)</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
<span class="code-keyword" style="color: #000091">import</span> org.hibernate.boot.MetadataSources;
<span class="code-keyword" style="color: #000091">import</span> org.hibernate.boot.registry.StandardServiceRegistryBuilder;
<span class="code-keyword" style="color: #000091">import</span> org.hibernate.boot.spi.MetadataImplementor;
<span class="code-keyword" style="color: #000091">import</span> org.hibernate.tool.hbm2ddl.SchemaUpdate;
<span class="code-keyword" style="color: #000091">import</span> org.hsqldb.jdbc.JDBCDataSource;
<span class="code-keyword" style="color: #000091">import</span> com.mysql.jdbc.jdbc2.optional.MysqlDataSource;
<span class="code-keyword" style="color: #000091">public</span> class Test {
        <span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">static</span> void main(<span class="code-object" style="color: #910091">String</span>[] args) {
                JDBCDataSource ds = <span class="code-keyword" style="color: #000091">new</span> JDBCDataSource();
                ds.setUrl(<span class="code-quote" style="color: #009100">"jdbc:hsqldb:mem:testdb"</span>);
                <span class="code-object" style="color: #910091">System</span>.out.println( <span class="code-quote" style="color: #009100">"********* Starting SchemaUpdate <span class="code-keyword" style="color: #000091; color: #009100">for</span> TEST (hsqldb)*************************"</span> );
                <span class="code-keyword" style="color: #000091">new</span> SchemaUpdate((MetadataImplementor) <span class="code-keyword" style="color: #000091">new</span> MetadataSources(<span class="code-keyword" style="color: #000091">new</span> StandardServiceRegistryBuilder()
                                .applySetting(org.hibernate.cfg.Environment.DIALECT, <span class="code-quote" style="color: #009100">"org.hibernate.dialect.HSQLDialect"</span>)
                                .applySetting(org.hibernate.cfg.Environment.DATASOURCE, ds).build())
                                .buildMetadata()).execute(<span class="code-keyword" style="color: #000091">false</span>, <span class="code-keyword" style="color: #000091">true</span>);
                <span class="code-object" style="color: #910091">System</span>.out.println( <span class="code-quote" style="color: #009100">"********* Starting SchemaUpdate <span class="code-keyword" style="color: #000091; color: #009100">for</span> TEST (mysql)*************************"</span> );
                <span class="code-keyword" style="color: #000091">new</span> SchemaUpdate((MetadataImplementor) <span class="code-keyword" style="color: #000091">new</span> MetadataSources(<span class="code-keyword" style="color: #000091">new</span> StandardServiceRegistryBuilder()
                                .applySetting(org.hibernate.cfg.Environment.DATASOURCE, <span class="code-keyword" style="color: #000091">new</span> MysqlDataSource()).build())
                                .buildMetadata()).execute(<span class="code-keyword" style="color: #000091">false</span>, <span class="code-keyword" style="color: #000091">true</span>);
        }
}
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<p style="margin: 10px 0 0 0">The log is</p>
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<pre class="code-java" style="margin: 10px 0 0 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
********* Starting SchemaUpdate <span class="code-keyword" style="color: #000091">for</span> TEST (hsqldb)*************************
thg 5 20, 2015 8:30:48 SA org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {5.0.0.Beta2}
thg 5 20, 2015 8:30:48 SA org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
thg 5 20, 2015 8:30:48 SA org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist
thg 5 20, 2015 8:30:48 SA org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {4.0.5.Final}
thg 5 20, 2015 8:30:49 SA org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.HSQLDialect
thg 5 20, 2015 8:30:49 SA org.hibernate.tool.hbm2ddl.SchemaUpdate execute
INFO: HHH000228: Running hbm2ddl schema update
********* Starting SchemaUpdate <span class="code-keyword" style="color: #000091">for</span> TEST (mysql)*************************
thg 5 20, 2015 8:30:50 SA org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect
thg 5 20, 2015 8:30:50 SA org.hibernate.engine.jdbc.env.internal.NormalizingIdentifierHelperImpl <init>
WARN: JDBC Driver reports it stores quoted identifiers in both mixed and upper <span class="code-keyword" style="color: #000091">case</span>
thg 5 20, 2015 8:30:50 SA org.hibernate.tool.hbm2ddl.SchemaUpdate execute
INFO: HHH000228: Running hbm2ddl schema update
Exception in thread <span class="code-quote" style="color: #009100">"main"</span> java.lang.ClassCastException: java.util.Collections$EmptyIterator cannot be <span class="code-keyword" style="color: #000091">cast</span> to java.lang.Iterable
        at org.hibernate.tool.schema.extract.internal.SequenceInformationExtractorNoOpImpl.extractMetadata(SequenceInformationExtractorNoOpImpl.java:45)
        at org.hibernate.tool.schema.extract.internal.legacy.DatabaseInformationImpl.initializeSequences(DatabaseInformationImpl.java:89)
        at org.hibernate.tool.schema.extract.internal.legacy.DatabaseInformationImpl.<init>(DatabaseInformationImpl.java:85)
        at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:136)
        at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:114)
        at core.Test.main(Test.java:23)
</pre>
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